Goethe's World View
GA 6
Part III: The Phenomena of the World of Colors
[ 1 ] The feeling that “men's great works of art are brought forth according to true and natural laws” continuously moved Goethe to seek out these true and natural laws of artistic creation. He is convinced that the effect of a work of art must depend upon the fact that a natural lawfulness shines forth from it. He wants to know this lawfulness. He wants to know for what reason the highest works of art are at the same time the highest works of nature. It becomes clear to him that the Greeks proceeded by exactly the same laws by which nature proceeds as they “developed out of the human shape the sphere of divine formation” (Italian Journey, January 28, 1787). He wants to see how nature brings about this formation so that he can understand it in works of art. Goethe describes how in Italy he gradually succeeded in coming to an insight into the natural lawfulness of artistic creation (see Confession of the Author). “Fortunately I could hold on to a few maxims brought over from poetry and proven to me by inner feeling and long use, so that it was indeed difficult but not impossible for me, through uninterrupted looking at nature and art, through lively effective conversation with more or less insightful experts, and through continuously living with more or less practical or thinking artists, gradually to separate an in general into its parts, without fragmenting it, and to become aware of its different actively interpenetrating elements.” Only one element does not want to reveal to him the natural laws by which it works in the work of art: color. Several canvases are “created and composed in his presence and carefully and thoroughly studied as to components, arrangement, and form.” The artists can give him an account of how they proceed with the composition. But as soon as the topic turns to the use of color everything seems arbitrary. No one knows what relationship holds good between color and chiaroscuro and between the individual colors. Goethe cannot ascertain the basis for the fact that yellow makes a warm and comfortable impression, blue evokes a feeling of cold, that yellow and reddish-blue beside each other produce a harmonious effect. He recognizes that he must first acquaint himself with the lawfulness of the world of color in nature, in order from there to penetrate into the mysteries of the use of colors.
[ 2 ] Neither the concepts about the physical nature of color phenomena which Goethe still had in his memory from student days nor the scientific compendia which he consulted for advice proved fruitful for his purpose. “Along with the rest of the world I was convinced that all the colors are contained in the light; no one had ever told me anything different, and I had never found the least cause to doubt it, because I had no further interest in this subject” (Confession of the Author). But as he began to be interested, he found that he could develop nothing for his purpose out of this view. The originator of this view, which Goethe found to dominate natural scientists and which still occupies the same position today, is Newton. This view asserts that white light, as it goes forth from the sun, is composed of colored lights. The colors arise through the fact that the individual component parts are separated out of white light. If one lets sunlight into a dark room through a small round opening and catches it upon a white screen set up at right angles to the direction of the in-streaming light, one obtains a white image of the sun. If one places a glass prism between the opening and the screen so that the light shines through it, the white, round sun image transforms itself. It appears shifted, drawn out lengthwise, and colored. This image is called the sun spectrum. If one holds the prism in such a way that the upper portions of the light have to take a shorter route within the volume of the glass than the lower portions do, then the colored image is shifted downward. The upper edge of the image is red, the lower edge is violet; the red goes downward into yellow, the violet upward into blue; the middle portion of the image is generally white. Only when the screen is a certain distance from the prism does the white in the middle disappear completely; the entire image appears colored, in the sequence from above downward of red, orange, yellow, green, light blue, indigo, and violet. From this experiment Newton and his followers deduced that the colors are originally contained in the white light but mixed with one another. They are separated from each other by the prism. They have the characteristic that in passing through a transparent body they are diverted from their direction to different degrees, which means they are refracted. The red light is least, the violet is most refracted. They appear in the spectrum in the sequence of their refractibility. If one looks through the prism at a narrow strip of paper on a black background, it also appears diverted. It is both broader and colored at the edges. The upper edge appears violet, the lower red; here also the violet goes over into blue, the red into yellow; the middle is generally white. The strip of paper appears totally colored only when the prism is at a certain distance from it. Again green appears in the middle. Here also the white of the paper is supposedly divided into its colored component parts. The Newtonians have a simple explanation for the fact that all the colors appear only when the prism is at a certain distance from the screen or paper strip, whereas the middle otherwise is white. They say that the more strongly diverted lights from the upper pan of the image and the more weakly diverted ones from the lower pan fall together in the middle and mix into white. The colors appear only at the edges because there none of the more strongly diverted parts of the light from above can fall into the most weakly diverted parts of the light, and none of the more weakly diverted ones from below can fall into the most strongly diverted ones.
[ 3 ] This is the view from which Goethe can develop nothing for his purposes. He therefore wants to observe the phenomena themselves. He turns to Privy Councillor Buettner in Jena who lends him the equipment with which to perform the necessary experiments. He is busy at first with other work and wants, when pressed by Buettner, to return the equipment. But before doing so he takes up a prism, in order to look through it at a completely white wall. He expects it to appear colored to different degrees. But the wall remains white. Only at those places where the white meets dark do colors arise. The window sashes appeared in the liveliest colors. From these observations Goethe. believes that he can know that the Newtonian view is incorrect and that the colors are not contained in white light. The boundary, the darkness, must have something to do with the arising of colors. He continues his experiments. He looks at white surfaces upon black, and at black surfaces on a white background. He gradually forms his own view. A white disk, viewed through a prism, appears shifted. The upper portions of the disk, in Goethe's opinion, shift themselves up over the black border of the background, whereas this black background extends itself up over the lower portions of the disk. If one now looks through the prism, one sees the black background through the upper portion of the disk as though through a white veil. If one looks at the lower pan of the disk, it appears through the darkness lifted up over it. Above, something light has been brought over something dark; below, something dark over something light. The upper edge appears blue, the lower one yellow. The blue goes over toward the black into violet; the yellow goes over downward into red. If the prism is moved away from the observed disk, the colored edges become broader; the blue downward, the yellow upward. When the prism is moved sufficiently far away, the yellow from below extends over the blue from above; through this overlapping green arises in the middle. To confirm this view, Goethe looks through the prism at a black disk upon a white background. Now up above something dark is brought over something light, below something light over something dark. Yellow appears above, blue below. When the edges are broadened by moving the prism away from the disk, the blue below, which goes over toward the middle into violet, is brought over the yellow above, which in broadening gradually takes on a red tone. A peach blossom color arises in the middle. Goethe said to himself that what is correct for the white disk must also hold good for the black one. “If there the light splits up into so many colors ... then here also the darkness would have to be regarded as split up into colors” (Confession of the Author). Goethe now relates to a physicist he knows his observations and the skepticism toward the Newtonian view which has arisen in him from them. The latter declares his skepticism to be unfounded. He explains the colored edges and the white in the middle, as well as their transition into green when the prism is moved the right distance away from the observed object, in accordance with the Newtonian view. Other natural scientists to whom Goethe brings the subject respond in the same way. He carries on by himself the observations in which he would gladly have had the help of people experienced in the field. He has a large prism made out of plate-glass and fills it with pure water. Because he notices that glass prisms, whose cross-section is an equilateral triangle, often hinder the observer by greatly broadening the colors that appear, he has his large prism made with the cross-section of an isosceles triangle whose smallest angle is only fifteen to twenty degrees. Goethe calls those experiments subjective which are set up in such a way that the eye looks at an object through the prism. These experiments present themselves to the eye but are not fixed in the outer world. He wants to add objective experiments to these as well. He uses a water prism for this. The light shines through a prism and the colors are caught on a screen behind the prism. Goethe now lets sunlight go through openings cut into cardboard. He obtains thereby an illuminated space bounded on all sides by darkness. This bounded light mass goes through the prism and is deflected in its direction by it. If one holds up a screen to this light mass issuing from the prism, there arises on it an image which generally is colored on its upper and lower edges. If the prism is placed in such a way that its cross section tapers downward, then the upper edge of the image is colored blue and the lower one yellow. The blue goes over toward the dark space into violet, and toward the lighted middle into light blue; the yellow toward the darkness into red. Also in this phenomenon Goethe traces the color phenomena to the border. Above, the bright light mass streams into the dark space; it lightens something dark, which thereby appears blue. Below the dark space streams into the light mass; it darkens something light and makes it appear yellow. When the screen is moved away from the prism the colored edges become broader; the yellow approaches the blue. With the streaming of the blue into the yellow, when the screen has been moved a suitable distance from the prism, green appears in the middle of the image. Goethe makes visible to himself the streaming of the light into the dark and of the dark into the light, by shaking into the line which the light mass takes through the dark space a fine white cloud of dust which he produces with fine dry hair powder. “The more or less colored phenomenon is now caught by the white atoms and presented to the eye in its entire breadth and length” (Color Theory, didactic part). Goethe finds that the view which he arrived at through subjective phenomena is confirmed by objective phenomena. The colors are brought forth by the working together of light and dark. The prism serves only to shift light and dark over each other.
[ 4 ] After making these experiments Goethe cannot accept the Newtonian view as his own. For him it is the same as with Haller's doctrine of incapsulation. Just as Haller thinks the fully developed organism to be already contained in the germ with all its parts, so the Newtonians believe that the colors, which under certain conditions appear with the light, are already enclosed within it. Against this belief he could use the same words which he brought against the doctrine of incapsulation, that it “rests upon a mere extra-sensory fancy, upon an assumption which one believes one thinks but which can never be demonstrated in the sense world.” For him the colors are new formations which are developed in connection with the light, not beings which are merely unfolded out of the light. Because of his “way of thinking in accordance with the idea” he must reject the Newtonian view. This view does not know the nature of the ideal. It acknowledges only what is factually present, what is present in the same way as the sense-perceptible. And wherever it cannot demonstrate factuality through the senses, it assumes it hypothetically. Because the colors develop in connection with the light, and must therefore already be contained in it as idea, this view believes that they are also factually, materially contained in the light and are only brought out by the prism and the dark border. Goethe knows that the idea is at work in the sense world; therefore he does not transfer something which is present as idea into the realm of the factual. The ideal works in inorganic nature just as in organic nature, only not as sensible-supersensible form. Its outer manifestation is completely material, merely sense-perceptible. It does not penetrate into the sense-perceptible; it does not permeate it with spirit. The processes of inorganic nature run their course in a lawful way, and this lawfulness presents itself to the observer as idea. If a person perceives white light in one place in space and colors in another place which arise in connection with the light, then a lawful relationship exists between both perceptions which can be pictured as idea. But if someone gives this idea a body and sets it out into space as something factual which passes over from the object of the one perception into that of the other perception, then that comes from his crudely physical way of picturing things. It is this crudely physical aspect about the Newtonian view which repelled Goethe. It is the idea that leads one inorganic process over into the other, not something factual which travels from one to the other.
[ 5 ] The Goethean world view can acknowledge only two sources for all knowledge of the inorganic nature processes: that which is sense-perceptible about these processes, and the ideal interconnections of the sense-perceptible which reveal themselves to thinking. The ideal interconnections within the sense world are not of the same kind. There are some which are directly obvious when sense perceptions appear beside each other or after each other, and others which one can see only when one traces them back to some of the first kind. In the manifestation which offers itself to the eye when it looks at something dark through something light and perceives blue, Goethe believes he recognizes an interconnection of the first kind between light, darkness, and color. It is the same thing when something light looked at through something dark gives yellow. The spectrum which appears at the borders allows us to recognize an interconnection which becomes clear to immediate observation. The spectrum which manifests in a sequence of seven colors from red to violet can only be understood when one sees how other determining factors are added to those through which the border phenomena arise. The simple border phenomena have joined in the spectrum into a complicated phenomenon which can be understood only when one traces it back to the basic phenomena. That which stands before the observer in its purity in the basic phenomenon appears impure, modified in that which is complicated by the additional determining factors. The simple facts are no longer directly recognizable. Goethe therefore seeks everywhere to trace complicated phenomena back to simple pure ones. He sees the explanation of inorganic nature to consist of this leading back. He goes no further than the pure phenomenon. In it an ideal interconnection of sense perceptions reveals itself which explains itself through itself. Goethe calls the pure phenomenon ”archetypal phenomenon” (Urphaenomen). He regards it as idle speculation to reflect further upon the archetypal phenomenon. “The magnet is an archetypal phenomenon which one only has to state in order to have explained it” (Aphorisms in Prose). A composite, phenomenon is explained when one shows how it is built up out of archetypal phenomena.
[ 6 ] Modern science proceeds differently from Goethe. It wants to trace the processes in the sense world back to the movements of the smallest particles of the body and, to explain these movements, uses the same laws by which it comprehends the movements which occur visibly in space. To explain these visible movements is the task of mechanics. If the movement of a body is observed then mechanics asks by which force it was set in motion; what distance it travels in a particular time; what form the line has in which it moves; etc. It seeks to represent mathematically the interrelationships of force, of the distance traveled, of the form of the path. Now the scientist states that the red light can be traced back to the oscillating movement of the body's smallest panicles which spreads itself out in space. This movement is comprehended by applying to it the laws won through mechanics. The science of inorganic nature considers its goal to be gradually to go over entirely into applied mechanics.
[ 7 ] Modern physics asks about the number of vibrations in a time unit which correspond to a particular color quality. From the number of vibrations which correspond to red, and from those which correspond to violet, it seeks to determine the physical relationship of both colors. The qualitative disappears from its view; it looks at the spatial and temporal aspects of the processes. Goethe asks what relationship exists between red and violet when one disregards the spatial and temporal and looks merely at the qualitative aspect of the colors. A postulate of the Goethean way of looking at things is that the qualitative is also really present in the outer world and forms one inseparable whole with the temporal and spatial. Modern physics on the other hand must start with the basic view that only the quantitative, only lightless and colorless processes of movement are present in the outer world, and that everything qualitative arises only as the effect of the quantitative upon the sense- and spirit-endowed organism. If this assumption were correct, then the lawful interrelationships of the qualitative could also not be sought in the outer world but would have to be traced back to the nature of the sense organs, of the nervous system, and of the organ of mental picturing. The qualitative elements of processes would then not be for physics to investigate but rather for physiology and psychology. Modern science does proceed in accordance with this presupposition. In its view the organism, in a way appropriate to the constitution of its eyes, optic nerve, and brain, translates one process of movement into the sensation red and another into the sensation violet. Therefore all the outer aspects of the color world are explained when one has seen the interconnection of the processes of movement by which this world is determined.
[ 8 ] A proof for this view is sought in the following observation. The optic nerve senses every outer impression as a light sensation. Not only light but also a bump or pressure on the eye, a tug on the retina when the eye is moved quickly, an electric current conducted through the head: all these also cause a sensation of light. A different sense experiences the same things in a different way. Bumps, pressure, tugs, electrical current, when they stimulate the skin, cause sensations of touch. Electricity stimulates in the ear a sound sensation, in the tongue a taste sensation. One deduces from this that the content of sensation, which arises in the organism through an outer effect, is different from the outer process by which it is caused. The red color is not experienced by the organism because the color is connected with a corresponding process of movement outside in space but rather because the eye, optic nerve, and brain of the organism are constituted in such a way that they translate a colorless process of movement into a color. The law expressed in this way was called the law of specific sense energies by the physiologist Johannes Mueller who first established it.
[ 9 ] This observation proves only that the sense- and spirit-endowed organism can translate impressions of the most diverse kinds into the language of the senses upon which they act, but not that the content of every sense impression is also present only inside the organism. When the optic nerve is tugged there arises an indefinite, completely general stimulation which contains nothing that would cause one to place its content out in space. A sensation which arises through a real light impression is inseparably connected in its content with the spatial-temporal that corresponds to it. The movement of a body and its color are content of perception in exactly the same way. If one pictures the movement in and for itself, one is abstracting from what is otherwise perceived about the body. All the other mechanical and mathematical mental pictures are taken from the world of perception in the same way as movement. Mathematics and mechanics arise through the fact that one pan is separated out from the content of the world of perception and considered in and for itself. Within reality there are no objects or processes whose content is exhausted when one has grasped about them what can be expressed through mathematics and mechanics. Everything mathematical and mechanical is connected to color, warmth, and other qualities. If it is necessary for physics to assume that for the perception of a color there are corresponding vibrations in space, of which a very small expansion and a very great velocity are characteristic, then these movements can only be thought of as analogous to the movements which occur visibly in space. That means, if the world of objects is thought of as in movement, right into its smallest elements, then it must also be pictured as being endowed, right into its smallest elements, with color, warmth, and other characteristics. Whoever takes colors, warmth, sounds, etc. to be qualities which exist as effects of outer processes through the mentally picturing organism and which exist only inside this organism, must also transfer into it everything mathematical and mechanical which is connected with these qualities. Then, however, nothing more is left him for his outer world. The red that I see and the light vibrations which the physicist demonstrates as corresponding to this red are in reality a unity which only the abstracting intellect can separate from one another. I would see the vibrations in space, which correspond to the quality “red,” as movement, if my eye were organized to do so. But I would have connected with the movement, the impression of the red color.
[ 10 ] Modern natural science transfers out into space an unreal abstraction, a vibrating substratum stripped of all qualities of sensation, and is astonished then that one cannot understand what can cause the mentally picturing organism, endowed with nerve apparatus and brain, to translate these indifferent processes of motion into the colorful sense world filled with warmth differentiations and sounds. Du Bois-Reymond therefore assumes that man, because of an insurmountable limit to his knowing, will never understand how the fact that “I taste sweetness, smell the fragrance of roses, hear organ tones, see red” is connected with certain movements of the smallest bodily particles in the brain, whose movements are in turn caused by the vibrations of the tasteless, odorless, soundless, and colorless elements of the outer world of objects. “It is indeed thoroughly and forever incomprehensible that it should not be a matter of indifference to a number of atoms of carbon, hydrogen, nitrogen, oxygen, etc. how they lie and move, how they lay and moved, how they will lie and move” (Limits to Knowing Nature, Leipzig, 1882). But there are absolutely no limits to knowledge here. Wherever in space there are a number of atoms in a definite movement, there is necessarily a definite quality (red, for example) also present. And conversely, where red appears movement must be present. Only a thinking which abstracts can separate the one from the other. Whoever thinks of the movement as separated within reality from the other content of the process to which the movement belongs cannot find the transition again from the one to the other.
[ 11 ] Only that about a process which is movement can be traced back again to movement; that which belongs to the qualitative element of the world of colors and light can also be traced back only to a similar qualitative element within the same realm. Mechanics traces complex movements back to simple ones which are immediately comprehensible. Color theory must trace complicated color phenomena back to simple ones which can be recognized in the same way. A simple process of movement is an archetypal phenomenon just like the emergence of yellow out of the interworking of light and dark. Goethe knows what the mechanical archetypal phenomena can accomplish for the explanation of inorganic nature. Whatever is not mechanical within the world of objects he leads back to archetypal phenomena which are not of a mechanical kind. Goethe has been reproached for having thrown out the mechanical way of looking at nature and for limiting himself only to the observation and stringing together of the sense-perceptible (see Harnack, for example, in his book, Goethe in the Period of his Completeness). Du Bois-Reymond finds (Goethe and More Goethe, Leipzig, 1883) that “Goethe's theorizing limits itself to allowing other phenomena to emerge from an archetypal phenomenon, as he calls it, in somewhat the way fog assumes successive shapes without any intelligible causal connection. It was the concept of mechanical causality which was totally lacking in Goethe.” But what else does mechanics do than let complex processes go forth out of simple archetypal phenomena? Goethe did exactly the same thing in the sphere of the color world that the physicist accomplishes in the sphere of processes of motion. Because Goethe is not of the view that all processes in inorganic nature are purely mechanical, it has therefore been denied that he has any concept of mechanical causality. Whoever does this only shows that he is himself in error as to what mechanical causality signifies within the world of objects. Goethe remains in what is qualitative about the world of light and colors; he leaves it up to others to express the quantitative, mechanical, mathematical. He “sought to keep his theory of color absolutely at a distance from mathematics, although right away certain points manifest clearly enough where the help of the art of measurement would be desirable ... But this lack may even be of benefit, inasmuch as it can now become the business of the ingenious mathematician himself to seek out where color theory needs his help, and how he can make his contribution to the perfecting of this pan of natural philosophy” (Paragraph 727 of the didactic pan of the Color Theory). The qualitative elements of the sense of sight, light, darkness, colors, must first be understood out of their own interconnections, be traced back to archetypal phenomena; then there can be investigated on a higher level of thinking what the relationship is between these interconnections and the quantitative, the mechanical-mathematical elements in the world of light and colors.
[ 12 ] Goethe wants to trace the connections within the qualitative realm of the color world back to the simplest elements in just as strict a sense as the mathematician or the mechanic does in his sphere. “We must learn from the mathematicians to take care to place next to each other only the elements which are closest to each other, or rather to deduce from each other the elements which are closest to them, and even where we use no calculations, we must always proceed as though we were obliged to render account to the strictest geometrician.—For actually it is the mathematical method which, because of its carefulness and purity, reveals right away any jump in its assertions, and its proofs are actually only detailed expositions showing that what is presented in combination was already there in its simple components and in its whole sequence, was viewed in its full scope and was correctly and irrefutably devised under all conditions” (The Experiment as Mediator between Subject and Object)
[ 13 ] Goethe draws the principles of explanation for phenomena directly from the realm of observation. He shows how the phenomena are interconnected within the experienceable world. For grasping nature he rejects mental pictures which point outside the region of observation. Any kind of explanation that oversteps the field of experience by bringing in factors to explain nature which by their very nature are not observable contradicts the Goethean world view. Just such an explanation is the one which seeks the nature of light in a light substance that as such is not perceived itself but that can only be observed as light in its way of working. Among this kind of explanation is the one which reigns in modern natural science, according to which the processes of movement of the world of light are carried out, not by the perceptible qualities which are given to the sense of sight, but rather by the smallest particles of imperceptible matter. It is not contrary to the Goethean world view to picture to oneself that a particular color is connected to a particular process of movement in space. But it is altogether contrary to it to maintain that this process of movement belongs to some realm of reality located outside of experience, belongs to the world of matter which can, indeed, be observed in its effects, but not in its own being. For one who adheres to the Goethean world view the vibrations of light in space are processes which should not be accorded a kind of reality different from the rest of the content of perception. They elude direct observation not because they lie beyond the realm of experience but rather because human sense organs are not so finely organized that they directly perceive movements of such minuteness. If an eye were organized in such a way that it could observe in every detail the vibration of a thing which repeats itself four hundred billion times in one second, then such a process would present itself in exactly the same way as a process in the crudely perceptible world. That means, the vibrating thing would manifest the same characteristics as other things of perception.
[ 14 ] Every kind of explanation which traces the things and processes of experience back to other ones not located within the field of experience can attain content-filled mental pictures about this region of reality lying beyond observation only by borrowing certain characteristics from the world of experience and carrying them over onto the unexperienceable. In this way the physicist carries over hardness, impenetrability, onto the smallest elements of bodies, to which he still further ascribes the ability to attract and repel their own kind; on the other hand he does not attribute color, warmth, and other characteristics to these elements. He believes he explains an experienceable process of nature by leading it back to one that is not experienceable. According to Du Bois-Reymond's view, to know nature is to lead the processes in the world of objects back to the movements of atoms which are caused by their attracting and repelling forces (Limits to Knowing Nature, Leipzig, 1882). Matter, the substance filling space, is considered to be what is moving in all this. This substance is supposed to have been there from all eternity and will be there for all eternity. But matter is not supposed to belong to the sphere of observation but rather to be present beyond it. Du Bois-Reymond therefore assumes that man is incapable of knowing the real nature of matter itself, that he therefore leads the processes of the world of objects back to something whose nature will remain forever unknown to him. “We will never know better than we know today what haunts the space here where matter is” (Limits to Knowing Nature). When considered more exactly this concept of matter dissolves into nothing. The real content which one gives to this concept is borrowed from the world of experience. One perceives movements within the world of experience. One feels a pull when one holds a weight in one's hand, and a pressure when one lays a weight upon the palm of one's hand held out horizontally. In order to explain this perception one forms the concept of force. One pictures to oneself that the earth draws the weight to itself. The force itself cannot be perceived. It is ideal. But it belongs nevertheless to the sphere of observation. The mind observes it, because the mind sees the ideal relationships of the perceptions to one another. One is led to the concept of a force of repulsion when squeezing a piece of rubber and then letting it go. It restores itself to its previous shape and size. One pictures to oneself that the compressed parts of the rubber repel each other and again occupy their previous space. The way of thinking now under consideration carries such mental pictures, derived from observation, into an unexperienceable sphere of reality. It therefore in reality does nothing more than to trace something experienceable back to another experienceable something. Only, it arbitrarily shifts the latter into the sphere of the unexperienceable. It can be shown, of any way of picturing things which speaks of something unexperienceable within its view of nature, that it takes up a few scraps from the sphere of experience and relegates them to a sphere of reality located beyond observation. If one takes the scraps of experience out of the mental picture of the unexperienceable, there then remains a concept without content, a non-concept. The explanation of something experienceable can only consist of one's leading it back to something else which is experienceable. One finally arrives at elements within experience which can no longer be traced back to other ones. These are not further explainable, because they need no explanation. They contain their explanation in themselves. Their immediate being consists of what they present to observation. For Goethe, light is such an element. According to his view, a person has come to know the light who without preconception perceives light in its manifestation. The colors arise in connection with light and their arising is understood when one shows how they arise in connection with light. Light itself is given in direct perception. One knows what is ideally inherent in it when one observes what connection there is between it and the colors. From the standpoint of the Goethean world view it is impossible to ask about the real nature of light, about something unexperienceable which corresponds to the phenomenon “light.” “For actually it is a vain undertaking to express the real nature of a thing. We become aware of workings, and a complete history of these workings would very well comprise, if need be, the real nature of that thing.” This means that a complete presentation of the workings of something experienceable comprises all the manifestations which are inherent in it as idea. “We struggle to no avail to portray the character of a person; but put together his actions, his deeds, and a picture of his character will come to meet us.—The colors are deeds of the light, deeds and sufferings (Leiden). [Translator's note: Leiden, like “to suffer,” connotes a positive “allowing,” as well as its more familiar meaning.] In this sense we can expect from them disclosures about the light” (didactic pan of the Color Theory, Preface).
[ 15 ] Light presents itself to observation as “the simplest, most undivided, most homogeneous being that we know” (Correspondence with Jacobi). Confronting it is the darkness. For Goethe darkness is not the completely powerless absence of light. It is something active. It confronts the light and enters with it into a mutual interaction. Modern natural science sees darkness as a complete nothingness. According to this view, the light which streams into a dark space has no resistance from the darkness to overcome. Goethe pictures to himself that light and darkness relate to each other like the north and south pole of a magnet. The darkness can weaken the light in its working power. Conversely, the light can limit the energy of the darkness. In both cases color arises. A view in physics that thinks of darkness as that which is completely inactive cannot speak of any such interaction. It must therefore trace the colors back to light alone. Darkness arises for observation as a phenomenon just as much as light does. What is dark is content of perception in the same sense as what is light. The one is only the opposite of the other. The eye that looks out into the night mediates the real perception of darkness. Were the darkness an absolute nothingness, then no perception at all would arise when the human being looks out into the dark.
[ 16 ] Yellow is a light which has been dampened by the darkness; blue is a darkness which has been weakened by the light.
[ 17 ] The eye is organized to mediate to the mentally picturing organism the phenomena of the world of light and color and the interconnections of these phenomena. In this it does not conduct itself in a merely receptive way but rather enters into a lively interaction with the phenomena. Goethe's striving is to know the nature of this interaction. He regards the eye as something altogether living and wants to gain insight into what its life manifests. How does the eye relate itself to the individual phenomenon? How does it relate itself to the interconnections of the phenomena? Those are questions which he poses himself. Light and darkness, yellow and blue are opposites. How does the eye experience these opposites? It must lie in the nature of the eye that it also experiences the interrelationships that exist between the individual perceptions. For, “the eye has the light to thank for its existence. Out of indifferent animal auxiliary organs, the light calls forth an organ for itself of its own kind; and thus the eye forms itself in connection with the light for the light, so that the inner light can come to meet the outer light” (didactic pan of the Color Theory, Introduction).
[ 18 ] Just as light and darkness act in opposition to each other in outer nature, so are the two states, into which the eye is brought by the two phenomena, opposite to each other. When one keeps one's eye open in a dark space, a certain lack makes itself felt. If on the other hand the eye is turned toward a brightly illuminated white surface, it becomes unable for a time to distinguish moderately illuminated objects. Seeing into the dark increases receptivity; seeing into brightness weakens it.
[ 19 ] Every impression upon the eye remains for a time within it. Whoever looks at the black cross-pieces between window panes against a bright background will, when he closes his eyes, still have the phenomenon before him for a while. If, while the impression still lasts, one looks at a light gray surface, the cross appears bright, the panes, on the other hand, dark. A reversal of the phenomenon occurs. It follows from this that the eye is predisposed through the one impression to create out of itself the opposite one. Just as in the outer world light and darkness stand in a relationship with each other, so also do the corresponding states in the eye. Goethe pictures to himself that the place in the eye upon which the dark cross fell is rested and receptive to a new impression. Therefore the gray surface works upon it in a livelier way than upon the other places in the eye which previously have received the stronger light from the window panes. The bright produces in the eye an inclination to the dark, the dark an inclination to the bright. If one holds a dark image in front of a light gray surface and, when the image is taken away, looks fixedly upon the same spot, the space which the dark image occupied appears much lighter than the rest of the surface. A gray image against a dark background appears brighter than the same image does against a light background. The eye is predisposed by the dark background to see the image as brighter, but the light background as darker. Through these phenomena there is indicated to Goethe the great activity of the eye “;and the quiet opposition which every living thing is driven to show when any particular state is presented it. Thus, breathing in already presupposes breathing out, and vice versa ... It is the eternal formula of life which manifests itself here also. When the eye is offered the dark, it then demands the bright; it demands dark when one confronts it with bright and precisely through this shows its liveliness, its right to grasp the object by bringing forth from itself something which opposes the object” (Para. 38 of the didactic pan of the Color Theory).
[ 20 ] In the same way as light and darkness, color perceptions also call forth a counter activity in the eye. Hold a small piece of yellow paper in front of a moderately illuminated white screen and look fixedly at the small yellow surface. After a while take the paper away. At the place which the paper filled, one will see violet. The eye is predisposed by the impression of the yellow to produce the violet out of itself. In the same way blue will bring forth orange, and red green as a counter activity. Every color sensation therefore has a living connection in the eye with another. The states into which the eye is brought by perceptions stand in a relationship similar to that of the contents of these perceptions in the outer world.
[ 21 ] When light and darkness, bright and dark, work upon the eye, then this living organ comes to meet them with its demands; when they work upon things outside in space, then the things enter into interaction with them. Empty space has the characteristic of transparency. It does not at all affect light and darkness. These shine through it in their own lively nature. The case is different when space is filled with things. This filling of space can be such that the eye does not become aware of it because light and darkness in their original form shine right through it. Then one speaks of transparent things. If light and darkness do not shine unweakened through a thing, then it is called turbid. A turbid filling of space offers the possibility of observing light and darkness, bright and dark in their mutual relationship. Something bright, seen through something turbid, appears yellow; something dark, seen through something turbid, appears blue. What is turbid is something material which has been brightened by light. Against a brighter livelier light located behind it, what is turbid is dark; against a darkness that shines through it, it acts like something bright. Therefore, when something turbid confronts the light or darkness, there really work into one another an existing brightness and an existing dark.
[ 22 ] If the turbidity, through which the light is shining, gradually increases, then the yellow passes over into yellowish red and then into ruby red. If the turbidity, through which the dark is penetrating, lessens, then the blue goes over into indigo and finally into violet. Yellow and blue are basic colors. They arise through the working together of brightness or dark with turbidity. Both can take on a reddish tone, the former through an increasing of the turbidity, the latter by a lessening of it. Red, accordingly, is not a basic color. It appears as a color tone connected to yellow or blue. Yellow, with its reddish nuances which intensify as far as pure red, is close to the light; blue, with its shades, is related to the darkness. When blue and yellow mix, green arises; if blue which has been intensified to violet mixes with yellow which has been darkened into red, then the purple color arises.
[ 23 ] Goethe pursues these basic phenomena within nature. The bright disk of the sun, seen through a haze of turbid vapors, appears yellow. Dark cosmic space, viewed through the vapors of the atmosphere which are illumined by the light of day, presents itself as the blue of the heavens. “In the same way the mountains also appear blue to us: for, through our viewing them at such a distance that we no longer see their local colors, and that light from their surfaces no longer works upon our eye, they act as a pure dark object which now appears blue through the vapors between them and us” (Para. 156 of the didactic part of the Color Theory).
[ 24 ] Out of his absorption in the works of painters the need grew in Goethe to penetrate into the laws to which the phenomena of the sense of sight are subject. Every painting presented him with riddles. How does chiaroscuro relate to the colors? In what relationships do the individual colors stand to one another? Why does yellow give a happy mood, blue a serious one? Out of the Newtonian theory of color there was no way of gaining a viewpoint from which these mysteries could be revealed. This view traces all colors back to light, arranges them sequentially side by side, and says nothing about their relationships to the dark, and also nothing about their living connections to each other. From insights gained along his own path, Goethe was able to solve the riddles which art had posed him. Yellow must possess a happy, cheerful, mildly stimulating character, for it is the color closest to light. It arises through the slightest toning down of the light. Blue points to the dark which works in it. Therefore it gives a feeling of cold just as “it also reminds one of shadows.” Reddish yellow arises through the intensification of yellow toward the dark pole. Through this intensification its energy grows. The happy, cheerful feeling passes over into the blissful. As soon as the intensification goes still further, from reddish yellow into yellowish red, the happy, blissful feeling transforms itself into the impression of something forceful. Violet is blue which is striving toward the bright. Through this the restfulness and cold of blue become restlessness. In bluish red this restlessness experiences a further increase. Pure red stands in the middle between yellowish red and bluish red. The storminess of the yellow appears lessened, the languid restfulness of the blue enlivens itself. The red gives the impression of ideal contentment, of the equalizing of opposites. A feeling of contentment also arises through green, which is a mixture of yellow and blue. But because here the cheerfulness of the yellow is not intensified, and the restfulness of the blue is not disturbed by a reddish tone, the contentment will be a purer one than that which red brings forth.
[ 25 ] When a color is brought to it, the eye right away asks for another one. When it looks at yellow, there arises in it the longing for violet; when it perceives blue, it then demands orange; when it sees red, it then desires green. It is comprehensible that the feeling of contentment arises when, beside a color which is presented to the eye, another one is placed for which, in accordance with its nature, it is striving. The law of color harmony results from the nature of the eye. Colors which the eye asks for side by side have a harmonious effect. If two colors appear side by side which do not ask for each other, then the eye is stimulated to react. The juxtaposition of yellow and purple has something one-sided, but happy and magnificent. The eye wants violet next to yellow in order to be able to live in accordance with its nature. If purple takes the place of violet then the object asserts its claims over against those of the eye. It does not accomodate itself to the demands of this organ. Juxtapositions of this kind serve to indicate what is significant about the things. They do not want unconditionally to satisfy but rather to characterize. Those colors lend themselves to such characteristic connections which do not stand in complete opposition to each other but which also do not go directly over into each other. Juxtapositions of this latter kind give something characterless to the things on which they occur.
[ 26 ] The becoming and being of the phenomena of light and colors revealed itself to Goethe in nature. He also recognized it again in the creations of the painters in which it is raised to a higher level, is translated into the spiritual. Through his observations of the perceptions of sight Goethe gained a deep insight into the relationship of nature and an. He must have been thinking of this when, after the completion of the Color Theory, he wrote to Frau von Stein about these observations: “I do not regret having sacrificed so much time to them. Through them I have attained a culture which would have been difficult for me to acquire from any other side.”
[ 27 ] The Goethean color theory differs from that of Newton and of those physicists who construct their views upon Newton's mental pictures, because Goethe takes his start from a world view different from that of these physicists. Someone who does not really see the connection described here between Goethe's general picture of nature and his theory of color cannot do anything other than believe that Goethe came to his views on color because he lacked a sense for the physicist's genuine methods of observation. Someone with insight into this connection will also see that within the Goethean world view no other theory of color is possible than his. He would not have been able to think differently about the nature of color phenomena than he did, even if all the discoveries made since his time had been spread out before him, and if he himself could have employed with exactness the modern experimental methods which have become so refined. Even if, after becoming aware of the discovery of the Frauenhofer lines, he cannot fully incorporate them into his view of nature, neither they nor any other discovery in the realm of optics contradict his conception. The point in all this is only to build up this Goethean conception in such a way that these phenomena fit themselves into this conception. Admittedly, someone who stands on the point of view of the Newtonian conception would not be able to picture to himself anything of Goethe's views on colors. But this does not stem from the fact that such a physicist knows of phenomena which contradict the Goethean conception but rather from the fact that he has accustomed himself to a view of nature which hinders him from knowing what the Goethean view of nature actually wants.
Die Erscheinungen der Farbenwelt
[ 1 ] Goethe wird durch die Empfindung, daß «die hohen Kunstwerke von Menschen nach wahren und natürlichen Gesetzen hervorgebracht» sind, fortwährend angeregt, diese wahren und natürlichen Gesetze des künstlerischen Schaffens aufzusuchen. Er ist überzeugt, die Wirkung eines Kunstwerkes müsse darauf beruhen, daß aus demselben eine natürliche Gesetzmäßigkeit herausleuchtet. Er will diese Gesetzmäßigkeit erkennen. Er will wissen, aus welchem Grunde die höchsten Kunstwerke zugleich die höchsten Naturwerke sind. Es wird ihm klar, daß die Griechen nach eben den Gesetzen verfuhren, nach denen die Natur verfährt, als sie «aus der menschlichen Gestalt den Kreis göttlicher Bildung» entwickelten (Italienische Reise, 28. Januar 1787). Er will sehen, wie die Natur diese Bildung zustande bringt, um sie in den Kunstwerken verstehen zu können. Goethe schildert, wie es ihm in Italien allmählich gelungen ist, zu einer Einsicht in die natürliche Gesetzmäßigkeit des künstlerischen Schaffens zu kommen (vgl. «Konfession des Verfassers», Kürschner, Band 36). «Zum Glück konnte ich mich an einigen von der Poesie herübergebrachten, mir durch inneres Gefühl und langen Gebrauch bewährten Maximen festhalten, so daß es mir zwar schwer, aber nicht unmöglich ward, durch ununterbrochenes Anschauen der Natur und Kunst, durch lebendiges wirksames Gespräch mit mehr oder weniger einsichtigen Kennern, durch stetes Leben mit mehr oder weniger praktischen oder denkenden Künstlern, nach und nach mir die Kunst überhaupt einzuteilen, ohne sie zu zerstückeln, und ihre verschiedenen, lebendig ineinander greifenden Elemente gewahr zu werden.» Nur ein einziges Element will ihm nicht die natürlichen Gesetze offenbaren, nach denen es im Kunstwerke wirkt: das Kolorit. Mehrere Gemälde werden «in seiner Gegenwart erfunden und komponiert, die Teile, der Stellung und der Form nach, sorgfältig durchstudiert». Die Künstler können ihm Rechenschaft geben, wie sie bei der Komposition verfahren. Sobald aber die Rede aufs Kolorit kommt, da scheint alles von der Willkür abzuhängen. Niemand weiß, welcher Bezug zwischen Farbe und Helldunkel, und zwischen den einzelnen Farben herrscht. Worauf es beruht, daß Gelb einen warmen und behaglichen Eindruck macht, Blau die Empfindung der Kälte hervorruft, daß Gelb und Rotblau nebeneinander eine harmonische Wirkung hervorbringen, darüber kann Goethe keinen Aufschluß gewinnen. Er sieht ein, daß er sich mit der Gesetzmäßigkeit der Farbenwelt in der Natur erst bekannt machen muß, um von da aus in die Geheimnisse des Kolorits einzudringen.
[ 2 ] Weder die Begriffe über die physische Natur der Farbenerscheinungen, die Goethe von seiner Studienzeit her noch im Gedächtnis hatte, noch die physikalischen Kompendien, die er um Rat fragte, erwiesen sich für seinen Zweck als fruchtbar. «Wie alle Welt war ich überzeugt, daß die sämtlichen Farben im Licht enthalten seien; nie war es mir anders gesagt worden und niemals hatte ich die geringste Ursache gefunden, daran zu zweifeln, weil ich bei der Sache nicht weiter interessiert war» («Konfession des Verfassers », Kürschner, Band 36/2). Als er aber anfing, interessiert zu sein, da fand er, daß er aus dieser Ansicht nichts für seinen Zweck entwickeln konnte. Der Begründer dieser Ansicht, die Goethe bei den Naturforschern herrschend fand und die heute noch dieselbe Stellung einnimmt, ist Newton. Sie behauptet, das weiße Licht, wie es von der Sonne ausgeht, ist aus farbigen Lichtern zusammengesetzt. Die Farben entstehen dadurch, daß die einzelnen Bestandteile aus dem weißen Lichte ausgesondert werden. Läßt man durch eine kleine runde Öffnung Sonnenlicht in ein dunkles Zimmer treten, und fängt es auf einem weißen Schirme, der senkrecht gegen die Richtung des einfallenden Lichtes gestellt wird, aut., so erhält man ein weißes Sonnenbild. Stellt man zwischen die Öffnung und den Schirm ein Glasprisma, durch welches das Licht durchstrahlt, so verändert sich das weiße runde Sonnenbild. Es erscheint verschoben, in die Länge gezogen und farbig. Man nennt dieses Bild Sonnenspektrum. Bringt man das Prisma so an, daß die oberen Partien des Lichtes einen kürzeren Weg innerhalb der Glasmasse zurückzulegen haben als die unteren, so ist das farbige Bild nach unten verschoben. Der obere Rand des Bildes ist rot, der untere violett; das Rote geht nach unten in Gelb, das Violette nach oben in Blau über; die mittlere Partie des Bildes ist im allgemeinen weiß. Nur bei einer gewissen Entfernung des Schirmes vom Prisma verschwindet das Weiße in der Mitte vollständig; das ganze Bild erscheint farbig, und zwar von oben nach unten in der Folge: rot, orange, gelb, grün, hellblau, indigo, violett. Aus diesem Versuche schließen Newton und seine Anhänger, daß die Farben ursprünglich in dem weißen Lichte enthalten seien, aber miteinander vermischt. Durch das Prisma werden sie voneinander gesondert. Sie haben die Eigenschaft, beim Durchgange durch einen durchsichtigen Körper verschieden stark von ihrer Richtung abgelenkt, das heißt gebrochen zu werden. Das rote Licht wird am wenigsten, das violette am meisten gebrochen. Nach der Stufenfolge ihrer Brechbarkeit erscheinen sie im Spektrum. Betrachtet man einen schmalen Papierstreifen auf schwarzem Grunde durch das Prisma, so erscheint derselbe ebenfalls abgelenkt. Er ist zugleich breiter und an seinen Rändern farbig. Der obere Rand erscheint violett, der untere rot; das Violette geht auch hier ins Blaue, das Rote ins Gelbe über; die Mitte ist im allgemeinen weiß. Nur bei einer gewissen Entfernung des Prismas von dem Streifen erscheint dieser ganz farbig. In der Mitte erscheint wieder das Grün. Auch hier soll das Weiße des Papierstreifens in seine farbigen Bestandteile zerlegt sein. Daß nur bei einer gewissen Entfernung des Schirmes oder Streifens vom Prisma alle Farben erscheinen, während sonst die Mitte weiß ist, erklären die Newtonianer einfach. Sie sagen: in der Mitte fallen die stärker abgelenkten Lichter vom oberen Teil des Bildes mit den schwächer abgelenkten vom unteren zusammen und vermischen sich zu Weiß. Nur an den Rändern erscheinen die Farben, weil hier in die am schwächsten abgelenkten Lichtteile keine stärker abgelenkten von oben und in die am stärksten abgelenkten keine schwächer abgelenkten von unten hineinfallen können.
[ 3 ] Dies ist die Ansicht, aus der Goethe für seinen Zweck nichts entwickeln kann. Er will deshalb die Erscheinungen selbst beobachten. Er wendet sich an Hofrat Büttner in Jena, der ihm die Apparate leihweise überläßt, mit denen er die nötigen Versuche anstellen kann. Er ist zunächst mit anderen Arbeiten beschäftigt und will, auf Büttners Drängen, die Apparate wieder zurückgeben. Vorher nimmt er doch noch ein Prisma zur Hand, um durch dasselbe auf eine völlig geweißte Wand zu sehen. Er erwartet, daß sie in verschiedenen Stufen gefärbt erscheine. Aber sie bleibt weiß. Nur an den Stellen, wo das Weiße an Dunkles stößt, treten Farben auf. Die Fensterstäbe erscheinen in den allerlebhaftesten Farben. Aus diesen Beobachtungen glaubt Goethe zu erkennen, daß die Newtonsche Anschauung falsch sei, daß die Farben nicht im weißen Lichte enthalten seien. Die Grenze, das Dunkle, müsse mit der Entstehung der Farben etwas zu tun haben. Er setzt die Versuche fort. Weiße Flächen auf schwarzem und schwarze Flächen auf weißem Grunde werden betrachtet. Allmählich bildet er sich eine eigene Ansicht. Eine weiße Scheibe auf schwarzem Grunde erscheint beim Durchblicken durch das Prisma verschoben. Die oberen Partien der Scheibe, meint Goethe, schieben sich über das angrenzende Schwarz des Untergrundes; während sich dieser Untergrund über die unteren Partien der Scheibe hinzieht. Sieht man nun durch das Prisma, so erblickt man durch den oberen Scheibenteil den schwarzen Grund wie durch einen weißen Schleier. Besieht man sich den unteren Teil der Scheibe, so scheint dieser durch das übergelagerte Dunkel hindurch. Oben wird ein Helles über ein Dunkles geführt; unten ein Dunkles über ein Helles. Der obere Rand erscheint blau, der untere gelb. Das Blau geht gegen das Schwarze zu in Violett; das Gelbe nach unten in ein Rot über. Wird das Prisma von der beobachteten Scheibe entfernt, so verbreitern sich die farbigen Ränder; das Blau nach unten, das Gelb nach oben. Bei hinreichender Entfernung greift das Gelb von unten über das Blau von oben; durch das Übereinandergreifen entsteht in der Mitte Grün. Zur Bestätigung dieser Ansicht betrachtet Goethe eine schwarze Scheibe auf weißem Grunde durch das Prisma. Nun wird oben ein Dunkles über ein Helles, unten ein Helles über ein Dunkles geführt. Oben erscheint Gelb, unten Blau. Bei Verbreiterung der Ränder durch Entfernung des Prismas von der Scheibe wird das untere Blau, das allmählich gegen die Mitte zu in Violett übergeht, über das obere Gelb, das in seiner Verbreiterung nach und nach einen roten Ton erhält, geführt. Es entsteht in der Mitte Pfirsichblüt. Goethe sagte sich: was für die weiße Scheibe richtig ist, muß auch für die schwarze gelten. «Wenn sich dort das Licht in so vielerlei Farben auflöst... so müßte ja hier auch die Finsternis als in Farben aufgelöst angesehen werden.» («Konfession des Verfassers »,Kürschner, Band 36/2.) Goethe teilt nun seine Beobachtungen und die Bedenken, die ihm daraus gegen die Newtonsche Anschauung erwachsen sind, einem ihm bekannten Physiker mit. Dieser erklärt die Bedenken für unbegründet. Er leitete die farbigen Ränder und das Weiße in der Mitte, sowie dessen Übergang in Grün, bei gehöriger Entfernung des Prismas von dem beobachteten Objekt, im Sinne der Newtonschen Ansicht ab. Ähnlich verhalten sich andere Naturforscher, denen Goethe die Sache vorlegt. Er setzt die Beobachtungen, für die er gerne Beihilfe von kundigen Fachleuten gehabt hätte, allein fort. Er läßt ein großes Prisma aus Spiegelscheiben zusammensetzen, das er mit reinem Wasser anfüllt. Weil er bemerkt, daß die gläsernen Prismen, deren Querschnitt ein gleichseitiges Dreieck ist, wegen der starken Verbreiterung der Farbenerscheinung dem Beobachter oft hinderlich sind, läßt er seinem großen Prisma den Querschnitt eines gleichschenkeligen Dreieckes geben, dessen kleinster Winkel nur fünfzehn bis zwanzig Grade groß ist. Die Versuche, welche in der Weise angestellt werden, daß das Auge durch das Prisma auf einen Gegenstand blickt, nennt Goethe subjektiv. Sie stellen sich dem Auge dar, sind aber nicht in der Außenwelt fixiert. Er will zu diesen noch objektive hinzufügen. Dazu bedient er sich des Wasserprismas. Das Licht scheint durch ein Prisma durch, und hinter dem Prisma wird das Farbenbild auf einem Schirme aufgefangen. Goethe läßt nun das Sonnenlicht durch die Öffnungen ausgeschnittener Pappen hindurchgehen. Er erhält dadurch einen erleuchteten Raum, der ringsherum von Dunkelheit begrenzt ist. Diese begrenzte Lichtmasse geht durch das Prisma und wird durch dasselbe von ihrer Richtung abgelenkt. Hält man der aus dem Prisma kommenden Lichtmasse einen Schirm entgegen, so entsteht auf demselben ein Bild, das im allgemeinen an den Rändern oben und unten gefärbt ist. Ist das Prisma so gestellt, daß sein Querschnitt von oben nach unten schmäler wird, so ist der obere Rand des Bildes blau, der untere gelb gefärbt. Das Blau geht gegen den dunklen Raum in Violett, gegen die helle Mitte zu in Hellblau über; das Gelbe gegen die Dunkelheit zu in Rot. Auch bei dieser Erscheinung leitet Goethe die Farbenerscheinung von der Grenze her. Oben strahlt die helle Lichtmasse in den dunklen Raum hinein; sie erhellt ein Dunkles, das dadurch blau erscheint. Unten strahlt der dunkle Raum in die Lichtmasse hinein; er verdunkelt ein Helles und läßt es gelb erscheinen. Durch Entfernung des Schirmes von dem Prisma werden die Farbenränder breiter, das Gelbe nähert sich dem Blauen. Durch Einstrahlung des Blauen in das Gelbe erscheint bei hinlänglicher Entfernung des Schirmes vom Prisma in der Mitte des Bildes Grün. Goethe macht sich das Hineinstrahlen des Hellen in das Dunkle und des Dunklen in das Helle dadurch anschaulich, daß er in der Linie, in welcher die Lichtmasse durch den dunklen Raum geht, eine weiße feine Staubwolke erregt, die er durch feinen trockenen Haarpuder hervorbringt. «Die mehr oder weniger gefärbte Erscheinung wird nun durch die weißen Atome aufgefangen und dem Auge in ihrer ganzen Breite und Länge dargestellt.» (Farbenlehre, didaktischer Teil § 326.) Goethe findet seine Ansicht, die er an den subjektiven Erscheinungen gewonnen, durch die objektiven bestätigt. Die Farben werden durch das Zusammenwirken von Hell und Dunkel hervorgebracht. Das Prisma dient nur dazu, Hell und Dunkel übereinander zu schieben.
[ 4 ] Goethe kann, nachdem er diese Versuche gemacht hat, die Newtonische Ansicht nicht zu der seinigen machen. Es geht ihm mit ihr ähnlich, wie mit der Hallerschen Einschachtelungslehre. Wie diese den ausgebildeten Organismus bereits mit allen seinen Teilen im Keime enthalten denkt, so glauben die Newtonianer, daß die Farben, die unter gewissen Bedingungen am Lichte erscheinen, in diesem schon eingeschlossen seien. Er könnte gegen diesen Glauben dieselben Worte gebrauchen, die er der Einschachtelungslehre entgegengehalten hat, sie «beruhe auf einer bloßen außersinnlichen Einbildung, auf einer Annahme, die man zu denken glaubt, aber in der Sinnenwelt niemals darstellen kann.» Vgl. den Aufsatz über K. Fr. Wolff, Kürschner, Band 33.) Ihm sind die Farben Neubildungen, die an dem Lichte entwickelt werden, nicht Wesenheiten, die aus dem Lichte bloß ausgewickelt werden. Wegen seiner «der Idee gemäßen Denkweise» muß er die Newtonsche Ansicht ablehnen. Diese kennt das Wesen des Ideellen nicht. Nur was tatsächlich vorhanden ist, erkennt sie an. Was in derselben Weise vorhanden ist wie das Sinnlich-Wahrnehmbare. Und wo sie die Tatsächlichkeit nicht durch die Sinne nachweisen kann, da nimmt sie dieselbe hypothetisch an. Weil am Lichte die Farben sich entwickeln, also der Idee nach schon in demselben enthalten sein müssen, glaubt sie, sie seien auch tatsächlich, materiell in demselben enthalten und werden durch das Prisma und die dunkle Umgrenzung nur hervorgeholt. Goethe weiß, daß die Idee in der Sinnenwelt wirksam ist; deshalb versetzt er etwas, was als Idee vorhanden ist, nicht in den Bereich des Tatsächlichen. In der unorganischen Natur wirkt das Ideelle ebenso wie in der organischen, nur nicht als sinnlich-übersinnliche Form. Seine äußere Erscheinung ist ganz materiell, bloß sinnlich. Es dringt nicht ein in das Sinnliche; es durchgeistigt dieses nicht. Die Vorgänge der unorganischen Natur verlaufen gesetzmäßig, und diese Gesetzmäßigkeit stellt sich dem Beobachter als Idee dar. Wenn man an einer Stelle des Raumes weißes Licht und an einer andern Farben wahrnimmt, die an demselben entstehen, so besteht zwischen den beiden Wahrnehmungen ein gesetzmäßiger Zusammenhang, der als Idee vorgestellt werden kann. Wenn aber jemand diese Idee verkörperlicht und als Tatsächliches in den Raum hinaus versetzt, das von dem Gegenstande der einen Wahrnehmung in den der andern hinüberzieht, so entspringt das aus einer grobsinnlichen Vorstellungsweise. Dieses Grobsinnliche ist es, was Goethe von der Newtonschen Anschauung zurückstößt. Die Idee ist es, die einen unorganischen Vorgang in den andern hinüberleitet, nicht ein Tatsächliches, das von dem einen zu dem andern wandert.
[ 5 ] Die Goethesche Weltanschauung kann nur zwei Quellen für alle Erkenntnis der unorganischen Naturvorgänge anerkennen: dasjenige, was an diesen Vorgängen sinnlich wahrnehmbar ist, und die ideellen Zusammenhänge des Sinnlich-Wahrnehmbaren, die sich dem Denken offenbaren. Die ideellen Zusammenhänge innerhalb der Sinneswelt sind nicht gleicher Art. Es gibt solche, die unmittelbar einleuchtend sind, wenn sinnliche Wahrnehmungen nebeneinander oder nacheinander auftreten, und andere, die man erst durchschauen kann, wenn man sie auf solche der ersten Art zurückführt. In der Erscheinung, die sich dem Auge darbietet, wenn es ein Dunkles durch ein Helles ansieht und Blau wahrnimmt, glaubt Goethe einen Zusammenhang der ersten Art zwischen Licht, Finsternis und Farbe zu erkennen. Ebenso ist es, wenn Helles durch ein Dunkles angeschaut, gelb ergibt. Die Randerscheinungen des Spektrums lassen einen Zusammenhang erkennen, der durch unmittelbares Beobachten klar wird. Das Spektrum, das in einer Stufenfolge sieben Farben vom Rot bis zum Violett zeigt, kann nur verstanden werden, wenn man sieht, wie zu den Bedingungen, durch welche die Randerscheinungen entstehen, andere hinzugefügt werden. Die einfachen Randerscheinungen haben sich in dem Spektrum zu einem komplizierten Phänomen verbunden, das nur verstanden werden kann, wenn man es aus den Grunderscheinungen ableitet. Was in dem Grundphänomen in seiner Reinheit vor dem Beobachter steht, das erscheint in dem komplizierten, durch die hinzugefügten Bedingungen, unrein, modifiziert. Die einfachen Tatbestände sind nicht mehr unmittelbar zu erkennen. Goethe sucht daher die komplizierten Phänomene überall auf die einfachen, reinen zurückzuführen. In dieser Zurückführung sieht er die Erklärung der unorganischen Natur. Vom reinen Phänomen geht er nicht mehr weiter. In demselben offenbart sich ein ideeller Zusammenhang sinnlicher Wahrnehmungen, der sich durch sich selbst erklärt. Das reine Phänomen nennt Goethe Urphänomen. Er sieht es als mäßige Spekulation an, über das Urphänomen weiter nachzudenken. «Der Magnet ist ein Urphänomen, das man nur aussprechen darf, um es erklärt zu haben.» (Sprüche in Prosa, Kürschner, Band 36.) Ein zusammengesetztes Phänomen wird erklärt, wenn man zeigt, wie es sich aus Urphänomenen aufbaut.
[ 6 ] Die moderne Naturwissenschaft verfährt anders als Goethe. Sie will die Vorgänge in der Sinnenwelt auf Bewegungen kleinster Körperteile zurückführen und bedient sich zur Erklärung dieser Bewegungen derselben Gesetze, durch die sie die Bewegungen begreift, die sichtbar im Raume vor sich gehen. Diese sichtbaren Bewegungen zu erklären, ist Aufgabe der Mechanik. Wird die Bewegung eines Körpers beobachtet, so fragt die Mechanik: Durch welche Kraft ist er in Bewegung versetzt worden; welchen Weg legt er in einer bestimmten Zeit zurück; welche Form hat die Linie, in der er sich bewegt usw. Die Beziehungen der Kraft, des zurückgelegten Weges, der Form der Bahn sucht sie mathematisch darzustellen. Nun sagt der Naturforscher: Das rote Licht kann auf eine schwingende Bewegung kleinster Körperteile zurückgeführt werden, die sich im Raume fortpflanzt. Begriffen wird diese Bewegung dadurch, daß man die in der Mechanik gewonnenen Gesetze auf sie anwendet. Die Wissenschaft der unorganischen Natur betrachtet es als ihr Ziel, allmählich vollständig in angewandte Mechanik überzugehen.
[ 7 ] Die moderne Physik fragt nach der Anzahl der Schwingungen in der Zeiteinheit, welche einer bestimmten Farbenqualität entsprechen. Aus der Anzahl der Schwingungen, die dem Rot entsprechen und aus derjenigen, welche dem Violett entsprechen, sucht sie den physikalischen Zusammenhang der beiden Farben zu bestimmen. Vor ihren Blicken verschwindet das Qualitative; sie betrachtet das Räumliche und Zeitliche der Vorgänge. Goethe fragt: Welcher Zusammenhang besteht zwischen Rot und Violett, wenn man vom Räumlichen und Zeitlichen absieht und bloß das Qualitative der Farben betrachtet. Die Goethesche Betrachtungsweise hat zur Voraussetzung, daß das Qualitative wirklich auch in der Außenwelt vorhanden ist und mit dem Zeitlichen und Räumlichen ein untrennbares Ganzes ist. Die moderne Physik muß dagegen von der Grundanschauung ausgehen, daß in der Außenwelt nur Quantitatives, licht- und farblose Bewegungsvorgänge vorhanden seien, und daß alles Qualitative erst als Wirkung des Quantitativen auf den sinn- und geistbegabten Organismus entstehe. Wäre diese Annahme richtig, dann könnten die gesetzmäßigen Zusammenhänge des Qualitativen auch nicht in der Außenwelt gesucht, sie mußten aus dem Wesen der Sinneswerkzeuge, des Nervenapparates und des Vorstellungsorganes abgeleitet werden. Die qualitativen Elemente der Vorgänge wären dann nicht Gegenstand der physikalischen Untersuchung, sondern der physiologischen und psychologischen. Dieser Voraussetzung gemäß verfährt die moderne Naturwissenschaft. Der Organismus übersetzt, nach ihrer Ansicht, entsprechend der Einrichtung seiner Augen, seines Sehnervs und seines Gehirns einen Bewegungsvorgang in die Empfindung des Rot, einen andern in die des Violett. Daher ist alles Äußere der Farbenwelt erklärt, wenn man den Zusammenhang der Bewegungsvorgänge durchschaut hat, von denen diese Welt bestimmt wird.
[ 8 ] Ein Beweis für diese Ansicht wird in folgender Beobachtung gesucht. Der Sehnerv empfindet jeden äußeren Eindruck als Lichtempfindung. Nicht nur Licht, sondern auch ein Stoß oder Druck auf das Auge, eine Zerrung der Netzhaut bei schneller Bewegung des Auges, ein elektrischer Strom, der durch den Kopf geleitet wird: das alles bewirkt Lichtempfindung. Dieselben Dinge empfindet ein anderer Sinn in anderer Weise. Stoß, Druck, Zerrung, elektrischer Strom bewirken, wenn sie die Haut erregen, Tastempfindungen. Elektrizität erregt im Ohr eine Gehör-, auf der Zunge eine Geschmacksempfindung. Daraus schließt man, daß der Empfindungsinhalt, der im Organismus durch eine Einwirkung von außen auftritt, verschieden ist von dem äußeren Vorgange, durch den er veranlaßt wird. Die rote Farbe wird von dem Organismus nicht empfunden, weil sie an einen entsprechenden Bewegungsvorgang draußen im Raume gebunden ist, sondern weil Auge, Sehnerv und Gehirn des Organismus so eingerichtet sind, daß sie einen farblosen Bewegungsvorgang in eine Farbe übersetzen. Das hiermit ausgesprochene Gesetz wurde von dem Physiologen Johannes Müller, der es zuerst aufgestellt hat, das Gesetz der spezifischen Sinnesenergien genannt.
[ 9 ] Die angeführte Beobachtung beweist nur, daß der sinn- und geistbegabte Organismus die verschiedenartigsten Eindrücke in die Sprache der Sinne übersetzen kann, auf die sie ausgeübt werden. Nicht aber, daß der Inhalt jeder Sinnesempfindung auch nur im Innern des Organismus vorhanden ist. Bei einer Zerrung des Sehnervs entsteht eine unbestimmte, ganz allgemeine Erregung, die nichts enthält, was veranlaßt, ihren Inhalt in den Raum hinaus zu versetzen. Eine Empfindung, die durch einen wirklichen Lichteindruck entsteht, ist inhaltlich unzertrennlich verbunden mit dem Räumlich-Zeitlichen, das ihr entspricht. Die Bewegung eines Körpers und seine Farbe sind auf ganz gleiche Weise Wahmehmungsinhalt. Wenn man die Bewegung für sich vorstellt, so abstrahiert man von dem, was man noch sonst an dem Körper wahrnimmt. Wie die Bewegung, so sind alle übrigen mechanischen und mathematischen Vorstellungen der Wahrnehmungswelt entnommen. Mathematik und Mechanik entstehen dadurch, daß von dem Inhalte der Wahrnehmungswelt ein Teil ausgesondert und für sich betrachtet wird. In der Wirklichkeit gibt es keine Gegenstände oder Vorgänge, deren Inhalt erschöpft ist, wenn man das an ihnen begriffen hat, was durch Mathematik und Mechanik auszudrücken ist. Alles Mathematische und Mechanische ist an Farbe, Wärme und andere Qualitäten gebunden. Wenn der Physik nötig ist, anzunehmen, daß der Wahrnehmung einer Farbe Schwingungen im Raume entsprechen, denen eine sehr kleine Ausdehnung und eine sehr große Geschwindigkeit eigen ist, so können diese Bewegungen nur analog den Bewegungen gedacht werden, die sichtbar im Raume vorgehen. Das heißt, wenn die Körperwelt bis in ihre kleinsten Elemente bewegt gedacht wird, so muß sie auch bis in ihre kleinsten Elemente hinein mit Farbe, Wärme und andern Eigenschaften ausgestattet vorgestellt werden. Wer Farben, Wärme, Töne usw. als Qualitäten auffaßt, die als Wirkungen äußerer Vorgänge durch den vorstellenden Organismus nur im Innern desselben existieren, der muß auch alles Mathematische und Mechanische, das mit diesen Qualitäten zusammenhängt, in dieses Innere verlegen. Dann aber bleibt ihm für seine Außenwelt nichts mehr übrig. Das Rot, das ich sehe, und die Lichtschwingungen die der Physiker als diesem Rot entsprechend nachweist, sind in Wirklichkeit eine Einheit, die nur der abstrahierende Verstand voneinander trennen kann. Die Schwingungen im Raume, die der Qualität «Rot» entsprechen, würde ich als Bewegung sehen, wenn mein Auge dazu organisiert wäre. Aber ich würde verbunden mit der Bewegung den Eindruck der roten Farbe haben.
[ 10 ] Die moderne Naturwissenschaft versetzt ein unwirkliches Abstraktum, ein aller Empfindungsqualitäten entkleidetes, schwingendes Substrat in den Raum und wundert sich, daß nicht begriffen werden kann, was den vorstellenden mit Nervenapparaten und Gehirn ausgestatteten Organismus veranlassen kann, diese gleichgültigen Bewegungsvorgänge in die bunte, von Wärmegraden und Tönen durchsetzte Sinnenwelt zu übersetzen. Du Bois-Reymond nimmt deshalb an, daß der Mensch wegen einer unüberschreitbaren Grenze seines Erkennens nie verstehen werde, wie die Tatsache: «ich schmecke Süßes, rieche Rosenduft, höre Orgelton, sehe Rot», zusammenhängt mit bestimmten Bewegungen kleinster Körperteile im Gehirn, welche Bewegungen wieder veranlaßt werden durch die Schwingungen der geschmack-, geruch-, ton- und farbenlosen Elemente der äußeren Körperwelt. «Es ist eben durchaus und für immer unbegreiflich, daß es einer Anzahl von Kohlenstoff-, Wasserstoff-, Stickstoff-, Sauerstoff- usw. Atomen nicht sollte gleichgültig sein, wie sie liegen und sich bewegen, wie sie lagen und sich bewegten, wie sie liegen und sich bewegen werden.» («Grenzen des Naturerkennens», Leipzig 1882, S.33f.) Es liegt aber hier durchaus keine Erkenntnisgrenze vor. Wo im Raume eine Anzahl von Atomen in einer bestimmten Bewegung ist, da ist notwendig auch eine bestimmte Qualität (z.B. Rot) vorhanden. Und umgekehrt, wo Rot auftritt, da muß die Bewegung vorhanden sein. Nur das abstrahierende Denken kann das eine von dem andern trennen. Wer die Bewegung von dem übrigen Inhalte des Vorganges, zu dem die Bewegung gehört, in der Wirklichkeit abgetrennt denkt, der kann den Übergang von dem einen zu dem andern nicht wieder finden.
[ 11 ] Nur was an einem Vorgang Bewegung ist, kann wieder von Bewegung abgeleitet werden; was dem Qualitativen der Farben- und Lichtwelt angehört, kann auch nur auf ein ebensolches Qualitatives innerhalb desselben Gebietes zurückgeführt werden. Die Mechanik führt zusammengesetzte Bewegungen auf einfache zurück, die unmittelbar begreiflich sind. Die Farbentheorie muß komplizierte Farbenerscheinungen auf einfache zurückführen, die in gleicher Weise durchschaut werden können. Ein einfacher Bewegungsvorgang ist ebenso ein Urphänomen, wie das Entstehen des Gelben aus dem Zusammenwirken von Hell und Dunkel. Goethe weiß, was die mechanischen Urphänomene für die Erklärung der unorganischen Natur leisten können. Was innerhalb der Körperwelt nicht mechanisch ist, das führt er auf Urphänomene zurück, die nicht mechanischer Art sind. Man hat Goethe den Vorwurf gemacht, er habe die mechanische Betrachtung der Natur verworfen und sich nur auf die Beobachtung und Aneinanderreihung des Sinnlich-Anschaulichen beschränkt. Vgl. z.B. Harnack in seinem Buche «Goethe in der Epoche seiner Vollendung», S. 12) Du Bois-Reymond findet («Goethe und kein Ende», Leipzig 1883, S.29): «Goethes Theoretisieren beschränkt sich darauf, aus einem Urphänomen, wie er es nennt, andere Phänomene hervorgehen zu lassen, etwa wie ein Nebelbild dem andern folgt, ohne einleuchtenden ursächlichen Zusammenhang. Der Begriff der mechanischen Kausalität war es, der Goethe gänzlich abging.» Was tut aber die Mechanik anderes, als verwickelte Vorgänge aus einfachen Urphänomenen hervorgehen lassen? Goethe hat auf dem Gebiete der Farbenwelt genau dasselbe gemacht, was der Mechaniker im Gebiete der Bewegungsvorgänge leistet. Weil Goethe nicht der Ansicht ist, alle Vorgänge in der unorganischen Natur seien rein mechanische, deshalb hat man ihm den Begriff der mechanischen Kausalität aberkannt. Wer das tut, der zeigt nur, daß er selbst im Irrtum darüber ist, was mechanische Kausalität innerhalb der Körperwelt bedeutet. Goethe bleibt innerhalb des Qualitativen der Licht- und Farbenwelt stehen; das Quantitative, Mechanische, das mathematisch auszudrücken ist, überläßt er andern. Er «hat die Farbenlehre durchaus von der Mathematik entfernt zu halten gesucht, ob sich gleich gewisse Punkte deutlich genug ergeben, wo die Beihilfe der Meßkunst wünschenswert sein würde ... Aber so mag auch dieser Mangel zum Vorteil gereichen, indem es nunmehr des geistreichen Mathematikers Geschäft werden kann, selbst aufzusuchen, wo denn die Farbenlehre seiner Hilfe bedarf, und wie er zur Vollendung dieses Teils der Naturlehre das Seinige betragen kann.» (§ 727 des didaktischen Teiles der Farbenlehre.) Die qualitativen Elemente des Gesichtssinnes: Licht, Finsternis, Farben müssen erst aus ihren eigenen Zusammenhängen begriffen, auf Urphänomene zurückgeführt werden; dann kann auf einer höheren Stufe des Denkens untersucht werden, welcher Bezug besteht zwischen diesen Zusammenhängen und dem Quantitativen, dem Mechanisch-Mathematischen in der Licht- und Farbenwelt.
[ 12 ] Die Zusammenhänge innerhalb des Qualitativen der Farbenwelt will Goethe in ebenso strengem Sinne auf die einfachsten Elemente zurückführen, wie das der Mathematiker oder Mechaniker auf seinem Gebiete tut. Die «Bedächtlichkeit, nur das Nächste ans Nächste zu reihen, oder vielmehr das Nächste aus dem Nächsten zu folgern, haben wir von den Mathematikern zu lernen und selbst da, wo wir uns keiner Rechnung bedienen, müssen wir immer so zu Werke gehen, als wenn wir dem strengsten Geometer Rechenschaft zu geben schuldig wären. - Denn eigentlich ist es die mathematische Methode, welche wegen ihrer Bedächtlichkeit und Reinheit gleich jeden Sprung in der Assertion offenbart, und ihre Beweise sind eigentlich nur umständliche Ausführungen, daß dasjenige, was in Verbindung vorgebracht wird, schon in seinen einfachen Teilen und in seiner ganzen Folge da gewesen, in seinem ganzen Umfange übersehen und unter allen Bedingungen richtig und unumstößlich erfunden worden.» (« Der Versuch als Vermittler von Subjekt und Objekt» Kürschner, Band 34).
[ 13 ] Goethe entnimmt die Erklärungsprinzipien für die Erscheinungen unmittelbar aus dem Bereich der Beobachtung. Er zeigt, wie innerhalb der erfahrbaren Welt die Erscheinungen zusammenhängen. Vorstellungen, welche über das Gebiet der Beobachtung hinausweisen, lehnt er für die Naturauffassung ab. Alle Erklärungsarten, die das Feld der Erfahrung dadurch überschreiten, daß sie für die Naturerklärung Faktoren herbeiziehen, die ihrer Wesenheit nach nicht beobachtbar sind, widersprechen der Goetheschen Weltanschauung. Eine solche Erklärungsart ist diejenige, welche das Wesen des Lichtes in einem Lichtstoff sucht, der als solcher nicht selbst wahrgenommen, sondern nur in seiner Wirkungsweise als Licht beobachtet werden kann. Auch gehört zu diesen Erklärungsarten die in der modernen Naturwissenschaft herrschende, nach welcher die Bewegungsvorgänge der Lichtwelt nicht von den wahrnehmbaren Qualitäten, die dem Gesichtssinn gegeben sind, sondern von den kleinsten Teilen des nicht wahrnehmbaren Stoffes ausgeführt werden. Es widerspricht der Goetheschen Weltanschauung nicht, sich vorzustellen, daß eine bestimmte Farbe mit einem bestimmten Bewegungsvorgang im Raume verknüpft sei. Aber es widerspricht ihr durchaus, wenn behauptet wird, dieser Bewegungsvorgang gehöre einem außerhalb der Erfahrung gelegenen Wirklichkeitsgebiete an, der Welt des Stoffes, die zwar in ihren Wirkungen, nicht aber ihrer eigenen Wesenheit nach beobachtet werden kann. Für einen Anhänger der Goetheschen Weltanschauung sind die Lichtschwingungen im Raume Vorgänge, denen keine andere Art von Wirklichkeit zukommt als dem übrigen Wahmehmungsinhalt. Sie entziehen sich der unmittelbaren Beobachtung nicht deshalb, weil sie jenseits des Gebietes der Erfahrung liegen, sondern weil die menschlichen Sinnesorgane nicht so fein organisiert sind, daß sie Bewegungen von solcher Kleinheit noch unmittelbar wahrnehmen. Wäre ein Auge so organisiert, daß es das Hin- und Herschwingen eines Dinges, das in einer Sekunde sich vierhundert billionenmal wiederholt, noch in allen Einzelheiten beobachten könnte, so würde sich ein solcher Vorgang genau so darstellen wie einer der grobsinnlichen Welt. Das heißt, das schwingende Ding würde dieselben Eigenschaften zeigen, wie andere Wahrnehmungsdinge.
[ 14 ] Jede Erklärungsart, welche die Dinge und Vorgänge der Erfahrung aus anderen, nicht innerhalb des Erfahrungsfeldes gelegenen ableitet, kann zu inhaltvollen Vorstellungen von diesem jenseits der Beobachtung befindlichen Wirklichkeitsgebiete nur dadurch gelangen, daß sie gewisse Eigenschaften aus der Erfahrungswelt entlehnt und auf das Unerfahrbare überträgt. So überträgt der Physiker Härte, Undurchdringlichkeit auf die kleinsten Körperelemente, denen er außerdem noch die Fähigkeit zuschreibt, ihresgleichen anzuziehen und abzustoßen; dagegen erkennt er diesen Elementen Farbe, Wärme und andere Eigenschaften nicht zu. Er glaubt einen erfahrbaren Vorgang der Natur dadurch zu erklären, daß er ihn auf einen nicht erfahrbaren zurückführt. Nach Du Bois-Reymonds Ansicht ist Naturerkennen Zurückführen der Vorgänge in der Körperwelt auf Bewegungen von Atomen, die durch deren anziehende und abstoßende Kräfte bewirkt werden («Grenzen des Naturerkennens», Leipzig 1882, S. 10). Als das Bewegliche wird dabei die Materie, der den Raum erfüllende Stoff, angenommen. Dieser Stoff soll von Ewigkeit her dagewesen sein und wird in alle Ewigkeit hinein da sein. Dem Gebiete der Beobachtung soll aber die Materie nicht angehören, sondern jenseits desselben vorhanden sein. Du Bois-Reymond nimmt deshalb an, daß der Mensch unfähig sei, das Wesen der Materie selbst zu erkennen, daß er also die Vorgänge der Körperwelt auf etwas zurückführe, dessen Natur ihm immer unbekannt bleiben wird. «Nie werden wir besser als heute wissen, was hier im Raume, wo Materie ist, spukt.» («Grenzen des Naturerkennens», S.22.) Vor einer genauen Überlegung löst sich dieser Begriff der Materie in Nichts auf Der wirkliche Inhalt, den man diesem Begriffe gibt, ist aus der Erfahrungswelt entlehnt. Man nimmt Bewegungen innerhalb der Erfahrungswelt wahr. Man fühlt einen Zug, wenn man ein Gewicht in der Hand hält, und einen Druck, wenn man auf die horizontal hingehaltenene Handfläche ein Gewicht legt. Um diese Wahrnehmung zu erklären, bildet man den Begriff der Kraft. Man stellt sich vor, daß die Erde das Gewicht anzieht. Die Kraft selbst kann nicht wahrgenommen werden. Sie ist ideell. Sie gehört aber doch dem Beobachtungsgebiete an. Der Geist beobachtet sie, weil er die ideellen Bezüge der Wahrnehmungen untereinander anschaut. Zu dem Begriffe einer Abstoßungskraft wird man geführt, wenn man ein Stück Kautschuk zusammendrückt, und es sich dann selbst überläßt. Es stellt sich in seiner früheren Gestalt und Größe wieder her. Man stellt sich vor, die zusammengedrängten Teile des Kautschuks stoßen sich ab und nehmen den früheren Rauminhalt wieder ein. Solche aus der Beobachtung geschöpfte Vorstellungen überträgt die angedeutete Denkart auf das unerfahrbare Wirklichkeitsgebiet. Sie tut in Wirklichkeit also nichts, als ein Erfahrbares aus einem andern Erfahrbaren herleiten. Nur versetzt sie willkürlich das letztere in das Gebiet des Unerfahrbaren. Jeder Vorstellungsart, die innerhalb der Naturanschauung von einem Unerfahrbaren spricht, ist nachzuweisen, daß sie einige Lappen aus dem Gebiete der Erfahrung aufnimmt und in ein jenseits der Beobachtung gelegenes Wirklichkeitsgebiet verweist. Nimmt man die Erfahrungslappen aus der Vorstellung des Unerfabrbaren heraus, so bleibt ein inhaltloser Begriff, ein Unbegriff, zurück. Die Erklärung eines Erfahrbaren kann nur darin bestehen, daß man es auf ein anderes Erfahrbares zurückführt. Zuletzt gelangt man zu Elementen innerhalb der Erfahrung, die nicht mehr auf andere zurückgeführt werden können. Diese sind nicht weiter zu erklären, weil sie keiner Erklärung bedürftig sind. Sie enthalten ihre Erklärung in sich selbst. Ihr unmittelbares Wesen besteht in dem, was sie der Beobachtung darbieten. Ein solches Element ist für Goethe das Licht. Nach seiner Ansicht hat das Licht erkannt, wer es unbefangen in der Erscheinung wahrnimmt. Die Farben entstehen am Lichte und ihre Entstehung wird begriffen, wenn man zeigt, wie sie an demselben entstehen. Das Licht selbst ist in unmittelbarer Wahrnehmung gegeben. Was in ihm ideell veranlagt ist, erkennt man, wenn man beobachtet, welcher Zusammenhang zwischen ihm und den Farben ist. Nach dem Wesen des Lichtes zu fragen, nach einem Unerfahrbaren, das der Erscheinung «Licht» entspricht, ist vom Standpunkte der Goetheschen Weltanschauung aus unmöglich. «Denn eigentlich unternehmen wir umsonst, das Wesen eines Dinges auszudrücken. Wirkungen werden wir gewahr, und eine vollständige Geschichte dieser Wirkungen umfaßte wohl allenfalls das Wesen jenes Dinges.» Das heißt eine vollständige Darstellung der Wirkungen eines Erfahrbaren umfaßt alle Erscheinungen, die in ihm ideell veranlagt sind. «Vergebens bemühen wir uns, den Charakter eines Menschen zu schildern; man stelle dagegen seine Handlungen, seine Taten zusammen, und ein Bild des Charakters wird uns entgegentreten. - Die Farben sind Taten des Lichtes, Taten und Leiden. In diesem Sinne können wir von denselben Aufschlüsse über das Licht erwarten.» (Didaktischer Teil der Farbenlehre. Vorwort.)
[ 15 ] Das Licht stellt sich der Beobachtung dar als « das einfachste, unzerlegteste, homogenste Wesen, Jas wir kennen.» (Briefwechsel mit Jacobi, S. 167.) Ihm entgegengesetzt ist die Finsternis. Für Goethe ist die Finsternis nicht die vollkommen kraftlose Abwesenheit des Lichtes. Sie ist ein Wirksames. Sie stellt sich dem Licht entgegen und tritt mit ihm in Wechselwirkung. Die moderne Naturwissenschaft sieht die Finsternis an als ein vollkommenes Nichts. Das Licht, das in einen finstern Raum einströmt, hat, nach dieser Ansicht, keinen Widerstand der Finsternis zu überwinden. Goethe stellt sich vor, daß Licht und Finsternis sich zueinander. ähnlich verhalten wie der Nord- und Südpol eines Magneten Die Finsternis kann das Licht in seiner Wirkungskraft schwächen. Umgekehrt kann das Licht die Energie der Finsternis beschränken. In beiden Fällen entsteht die Farbe. Eine physikalische Anschauung, die sich die Finsternis als das vollkommen Unwirksame denkt, kann von einer solchen Wechselwirkung nicht sprechen. Sie muß daher die Farben allein aus dem Lichte herleiten. Die Finsternis tritt für die Beobachtung ebenso als Erscheinung auf wie das Licht. Das Dunkel ist in demselben Sinne Wahrnehmungsinhalt wie die Helle. Das eine ist nur der Gegensatz des andern. Das Auge, das in die Nacht hinausblickt, vermittelt die reale Wahrnehmung der Finsternis. Wäre die Finsternis das absolute Nichts, so entstände gar keine Wahrnehmung, wenn der Mensch in das Dunkel hinaussieht.
[ 16 ] Das Gelb ist ein durch die Finsternis gedämpftes Licht; das Blau eine durch das Licht abgeschwächte Finsternis.
[ 17 ] Das Auge ist dazu eingerichtet, dem vorstellenden Organismus die Erscheinungen der Licht- und Farbenwelt und die Bezüge dieser Erscheinungen zu vermitteln. Es verhält sich dabei nicht bloß aufnehmend, sondern tritt in lebendige Wechselwirkung mit den Erscheinungen. Goethe ist bestrebt, die Art dieser Wechselwirkung zu erkennen. Er betrachtet das Auge als ein durchaus Lebendiges und will seine Lebensäußerungen durchschauen. Wie verhält sich das Auge zu der einzelnen Erscheinung? Wie verhält es sich zu den Bezügen der Erscheinungen? Das sind Fragen, die er sich vorlegt. Licht und Finsternis, Gelb und Blau sind Gegensätze. Wie empfindet das Auge diese Gegensätze? Es muß in der Natur des Auges begründet sein, daß es die Wechselbeziehungen, die zwischen den einzelnen Wahrnehmungen bestehen, auch empfinde. Denn «das Auge hat sein Dasein dem Lichte zu danken. Aus gleichgültigen tierischen Hilfsorganen ruft sich das Licht ein Organ hervor, das seinesgleichen werde; und so bildet sich das Auge am Lichte fürs Licht, damit das innere Licht dem äußern entgegentrete.» (Didaktischer Teil der Farbenlehre. Einleitung.)
[ 18 ] So wie Licht und Finsternis sich in der äußeren Natur gegensätzlich verhalten, so stehen die beiden Zustände einander entgegen, in die das Auge durch die beiden Erscheinungen versetzt wird. Wenn man das Auge innerhalb eines finstern Raumes offen hält, so wird ein gewisser Mangel empfindbar. Wird es dagegen einer stark beleuchteten weißen Fläche zugewendet, so wird es für eine gewisse Zeit unfähig, mäßig beleuchtete Gegenstände zu unterscheiden. Das Sehen ins Dunkle steigert die Empfänglichkeit; dasjenige in das Helle schwächt sie ab.
[ 19 ] Jeder Eindruck aufs Auge bleibt eine Zeitlang in demselben. Wer ein schwarzes Fensterkreuz auf einem hellen Hintergrunde ansieht, wird, wenn er die Augen schließt, die Erscheinung noch eine Weile vor sich haben. Blickt man, während der Eindruck noch dauert, auf eine hellgraue Fläche, so erscheint das Kreuz hell, der Scheibenraum dagegen dunkel. Es findet eine Umkehrung der Erscheinung statt. Daraus folgt, daß das Auge durch den einen Eindruck disponiert wird, den entgegengesetzten aus sich selbst zu erzeugen. Wie in der Außenwelt Licht und Finsternis in Beziehung zu einander stehen, so auch die entsprechenden Zustände im Auge. Goethe stellt sich vor, daß der Ort im Auge, auf den das dunkle Kreuz fiel, ausgeruht und empfänglich für einen neuen Eindruck ist. Deshalb wirkt auf ihn die graue Fläche lebhafter als auf die übrigen Orte im Auge, die vorher das stärkere Licht von den Fensterscheiben empfangen haben. Hell erzeugt im Auge die Hinneigung zum Dunkel; Dunkel die zum Hellen. Wenn man ein dunkles Bild vor eine hellgraue Fläche hält und unverwandt, indem es vorgenommen wird, auf denselben Fleck sieht, so erscheint der Raum, den das dunkle Bild eingenommen hat, um vieles heller als die übrige Fläche. Ein graues Bild auf dunklem Grund erscheint heller als dasselbe Bild auf hellem. Das Auge wird durch den dunklen Grund disponiert, das Bild heller; durch den hellen es dunkler zu sehen. Goethe wird durch diese Erscheinungen auf die große Regsamkeit des Auges verwiesen «und den stillen Widerspruch, den jedes Lebendige zu äußern gedrungen ist, wenn ihm irgend ein bestimmter Zustand dargeboten wird. So setzt das Einatmen schon das Ausatmen voraus und umgekehrt... Es ist die ewige Formel des Lebens, die sich auch hier äußert. Wie dem Auge das Dunkle geboten wird, so fordert es das Helle; es fordert Dunkel, wenn man ihm Hell entgegenbringt und zeigt eben dadurch seine Lebendigkeit, sein Recht, das Objekt zu fassen, indem es etwas, das dem Objekt entgegengesetzt ist, aus sich selbst hervorbringt.» (§ 38 des didaktischen Teiles der Farbenlehre.)
[ 20 ] In ähnlicher Weise wie Licht und Finsternis rufen auch Farbenwahmehmungen eine Gegenwirkung im Auge hervor. Man halte ein kleines Stück gelbgefärbten Papiers vor eine mäßig erleuchtete weiße Tafel, und schaue unverwandt auf die kleine gelbe Fläche. Nach einiger Zeit hebe man das Papier hinweg. Man wird die Stelle, die das Papier ausgefüllt hat, violett sehen. Das Auge wird durch den Eindruck des Gelb disponiert, das Violett aus sich selbst zu erzeugen. Ebenso wird das Blaue das Orange, das Rote das Grün als Gegenwirkung hervorbringen. Jede Farbenempfindung hat also im Auge einen lebendigen Bezug zu einer andern. Die Zustände, in die das Auge durch Wahrnehmungen versetzt wird, stehen in einem ähnlichen Zusammenhange wie die Inhalte dieser Wahrnehmungen in der Außenwelt.
[ 21 ] Wenn Licht und Finsternis, Hell und Dunkel aufs Auge wirken, so tritt ihnen dieses lebendige Organ mit seinen Forderungen entgegen; wirken sie auf die Dinge draußen im Raume, so treten diese mit ihnen in Wechselwirkung. Der leere Raum hat die Eigenschaft der Durchsichtigkeit. Er wirkt auf Licht und Finsternis gar nicht. Diese scheinen durch ihn in ihrer eigenen Lebhaftigkeit durch. Anders ist es, wenn der Raum mit Dingen gefüllt ist. Diese Füllung kann eine solche sein, daß das Auge sie nicht gewahr wird, weil Licht und Finsternis in ihrer ursprünglichen Gestalt durch sie hindurch scheinen. Dann spricht man von durchsichtigen Dingen. Scheinen Licht und Finsternis nicht ungeschwächt durch ein Ding hindurch, so wird es als trüb bezeichnet. Die trübe Raumausfüllung bietet die Möglichkeit, Licht und Finsternis, Hell und Dunkel in ihrem gegenseitigen Verhältnis zu beobachten. Ein Helles durch ein Trübes gesehen, erscheint gelb, ein Dunkles blau. Das Trübe ist ein Materielles, das vom Lichte durchhellt wird. Gegenüber einem hinter ihm befindlichen helleren, lebhafteren Licht ist das Trübe dunkel; gegen eine durchscheinende Finsternis verhält es sich als Helles. Es wirken also, wenn ein Trübes sich dem Licht oder der Finsternis entgegenstellt, wirklich ein vorhandenes Helles und ein ebensolches Dunkles ineinander.
[ 22 ] Nimmt die Trübe, durch welche das Licht scheint, allmählich zu, so geht das Gelb in Gelbrot und dann in Rubinrot über. Vermindert sich die Trübe, durch die das Dunkel dringt, so geht das Blau in Indigo und zuletzt in Violett über. Gelb und Blau sind Grundfarben. Sie entstehen durch Zusammenwirken des Hellen oder Dunklen mit der Trübe. Beide können einen rötlichen Ton annehmen, jenes durch Vermehrung, dieses durch Verminderung der Trübe. Das Rot ist somit keine Grundfarbe. Es erscheint als Farbenton an dem Gelben oder Blauen. Gelb mit seinen rötlichen Nuancen, die sich bis zum reinen Rot steigern, steht dem Lichte nahe, Blau mit seinen Abtönungen ist der Finsternis verwandt. Wenn sich Blau und Gelb vermischen entsteht Grün; mischt sich das bis zum Violetten gesteigerte Blau mit dem zum Roten verfinsterten Gelb, so entsteht die Purpurfarbe.
[ 23 ] Diese Grunderscheinungen verfolgt Goethe innerhalb der Natur. Die helle Sonnenscheibe durch einen Flor von trüben Dünsten gesehen, erscheint gelb. Der dunkle Weltraum durch die vom Tageslicht erleuchteten Dünste der Atmosphäre angeschaut, stellt sich als das Blau des Himmels dar. «Ebenso erscheinen uns auch die Berge blau: denn, indem wir sie in einer solchen Ferne erblicken, daß wir die Lokalfarben nicht mehr sehen, und kein Licht von ihrer Oberfläche mehr auf unser Auge wirkt, so gelten sie als ein reiner finsterer Gegenstand, der nun durch die dazwischen tretenden Dünste blau erscheint.» (§ 156 des didaktischen Teiles der Farbenlehre.)
[ 24 ] Aus der Vertiefung in die Kunstwerke der Maler ist Goethe das Bedürfnis erwachsen, in die Gesetze einzudringen, denen die Erscheinungen des Gesichtssinnes unterworfen sind. Jedes Gemälde gab ihm Rätsel auf. Wie verhält sich das Hell-Dunkel zu den Farben? In welchen Beziehungen stehen die einzelnen Farben zueinander? Warum bewirkt Gelb eine heitere, Blau eine ernste Stimmung? Aus der Newtonschen Farbenlehre war kein Gesichtspunkt zu gewinnen, von dem aus diese Geheimnisse zu lüften gewesen wären. Sie leitet alle Farben aus dem Licht ab, stellt sie stufenweise nebeneinander und sagt nichts über ihre Beziehungen zum Dunkeln und auch nichts über ihre lebendigen Bezüge zueinander. Aus den auf eigenem Wege gewonnenen Einsichten konnte Goethe die Rätsel lösen, die ihm die Kunst aufgegeben hatte. Das Gelb muß eine heitere, muntere, sanft reizende Eigenschaft besitzen, denn es ist die nächste Farbe am Licht. Es entsteht durch die gelindeste Mäßigkeit desselben. Das Blau weist auf das Dunkle hin, das in ihm wirkt. Deshalb gibt es ein Gefühl von Kälte, so wie «es auch an Schatten erinnert». Das rötliche Gelb entsteht durch Steigerung des Gelben nach der Seite des Dunkeln. Durch diese Steigerung wächst seine Energie. Das Heitere, Muntere geht in das Wonnige über. Sobald die Steigerung noch weitergeht, vom Rotgelben ins Gelbrote, verwandelt sich das heitere, wonnige Gefühl in den Eindruck des Gewaltsamen. Das Violett ist das zum Hellen strebende Blau. Die Ruhe und Kälte des Blauen wird dadurch zur Unruhe. Eine weitere Zunahme erfährt diese Unruhe im Blauroten. Das reine Rot steht in der Mitte zwischen Gelbrot und Blaurot. Das Stürmische des Gelben erscheint gemindert, die lässige Ruhe des Blauen belebt sich. Das Rote macht den Eindruck der idealen Befriedigung, der Ausgleichung der Gegensätze. Ein Gefühl der Befriedigung entsteht auch durch das Grün, das eine Mischung von Gelb und Blau ist. Weil aber hier das Heitere des Gelben nicht gesteigert, die Ruhe des Blauen nicht gestört durch den rötlichen Ton ist, so wird die Befriedigung eine reinere sein als die, welche das Rot hervorbringt.
[ 25 ] Das Auge fordert, wenn ihm eine Farbe entgegengebracht wird, sogleich eine andere. Erblickt es Gelb, so entsteht in ihm die Sehnsucht nach dem Violetten; nimmt es Blau wahr, so verlangt es Orange; sieht es Rot, so begehrt es Grün. Es ist begreiflich, daß das Gefühl der Befriedigung entsteht, wenn neben einer Farbe, die dem Auge dargeboten wird, eine andere gesetzt wird, die es seiner Natur nach erstrebt. Aus dem Wesen des Auges ergibt sich das Gesetz der Farbenharmonie. Farben, die das Auge nebeneinander fordert, wirken harmonisch. Treten zwei Farben nebeneinander auf, von denen die eine nicht die andere fordert, so wird das Auge zur Gegenwirkung aufgeregt. Die Zusammenstellung von Gelb und Purpur hat etwas Einseitiges, aber Heiteres und Prächtiges. Das Auge will Violett neben Gelb, um sich naturgemäß ausleben zu können. Tritt Purpur an die Stelle des Violetten, so macht der Gegenstand seine Ansprüche gegenüber denen des Auges geltend. Er fügt sich den Forderungen des Organs nicht. Zusammenstellungen dieser Art dienen dazu, auf das Bedeutende der Dinge hinzuweisen. Sie wollen nicht unbedingt befriedigen, sondern charakterisieren. Zu solchen charakteristischen Verbindungen eignen sich Farben, die nicht in vollem Gegensatz zueinander stehen, die aber doch auch nicht unmittelbar ineinander übergehen. Zusammenstellungen der letzteren Art geben den Dingen, an denen sie vorkommen, etwas Charakterloses.
[ 26 ] Das Werden und Wesen der Licht- und Farbenerscheinungen hat sich Goethe in der Natur offenbart. Er hat es auch wiedererkannt in den Schöpfungen der Maler, in denen es auf eine höhere Stufe gehoben, ins Geistige übersetzt ist. Einen tiefen Einblick in das Verhältnis von Natur und Kunst hat Goethe durch seine Beobachtungen der Gesichtswahrnehmungen gewonnen. Daran mag er wohl gedacht haben, als er nach Vollendung der «Farbenlehre » über diese Beobachtungen an Frau von Stein schrieb: «Es reut mich nicht, ihnen soviel Zeit aufgeopfert zu haben. Ich bin dadurch zu einer Kultur gelangt, die ich mir von einer andern Seite her schwerlich verschafft hätte.»
[ 27 ] Die Goethesche Farbenlehre ist verschieden von derjenigen Newtons und derjenigen Physiker, die auf Newtons Vorstellungen ihre Anschauungen aufbauen, weil der erstere von einer andern Weltanschauung ausgeht als die letzteren. Wer nicht den hier dargestellten Zusammenhang zwischen Goethes allgemeinen Naturvorstellungen und seiner Farbenlehre ins Auge faßt, der wird nicht anders können, als glauben, Goethe sei zu seinen Farbenanschauungen gekommen, weil ihm der Sinn für die echten Beobachtungsmethoden des Physikers gemangelt habe. Wer diesen Zusammenhang durchschaut, der wird auch einsehen, daß innerhalb der Goetheschen Weltanschauung keine andere Farbenlehre möglich ist als die seinige. Er würde über das Wesen der Farbenerscheinungen nicht anders haben denken können, als er es tat, auch wenn alle seit seiner Zeit gemachten Entdeckungen auf diesem Gebiete vor ihm wären ausgebreitet gewesen, und wenn er die gegenwärtig so vervollkommneten Versuchsmethoden hätte selbst exakt handhaben können. Wenn er auch, nachdem er mit der Entdeckung der Frauenhoferschen Linien bekannt wird, diese auch im Sinne seiner Naturanschauung nicht völlig in diese einreihen kann, so sind doch weder sie noch sonst eine Entdekkung auf optischem Gebiete ein Einwand gegen seine Auffassung. Es handelt sich bei alledem nur darum, diese Goethesche Auffassung so auszubauen, daß diese Erscheinungen in ihrem Sinne in sie sich einfügen. Zuzugeben ist, daß wer auf dem Gesichtspunkte der Newtonschen Auffassung steht, sich bei Goethes Farbenansichten nichts vorstellen könne. Das rührt aber nicht davon her, weil ein solcher Physiker Erscheinungen kennt, die der Goetheschen Auffassung widersprechen, sondern weil er sich in eine Naturanschauung eingewöhnt hat, die ihn verhindert, zu erkennen, was die Goethesche Naturansicht eigentlich will.
The phenomena of the world of color
[ 1 ] Goethe is continually stimulated by the feeling that "the high works of art are produced by men according to true and natural laws" to seek out these true and natural laws of artistic creation. He is convinced that the effect of a work of art must be based on the fact that a natural lawfulness shines out of it. He wants to recognize this lawfulness. He wants to know why the highest works of art are also the highest works of nature. It becomes clear to him that the Greeks acted according to the very laws that nature follows when they developed "the circle of divine formation from the human form" (Italian Journey, January 28, 1787). He wanted to see how nature brought about this formation in order to be able to understand it in the works of art. Goethe describes how he gradually succeeded in Italy in gaining an insight into the natural laws of artistic creation (cf. "Konfession des Verfassers", Kürschner, vol. 36). "Fortunately, I was able to hold on to some maxims brought over from poetry and proven to me through inner feeling and long use, so that it became difficult but not impossible for me, through uninterrupted contemplation of nature and art, through lively effective conversation with more or less insightful connoisseurs, through constant life with more or less practical or thinking artists, to gradually divide art in general without fragmenting it, and to become aware of its various, lively interlocking elements." There is only one element that does not want to reveal to him the natural laws according to which it works in a work of art: color. Several paintings are "invented and composed in his presence, the parts carefully studied in terms of position and form". The artists can give him an account of how they proceed with the composition. But as soon as the discussion turns to coloring, everything seems to depend on arbitrariness. No one knows the relationship between color and chiaroscuro, or between the individual colors. Goethe is unable to find out why yellow makes a warm and cozy impression, why blue evokes the sensation of coldness, why yellow and reddish blue produce a harmonious effect when placed side by side. He realizes that he must first acquaint himself with the laws of the world of color in nature in order to penetrate the secrets of coloration from there.
[ 2 ] Neither the concepts about the physical nature of color phenomena that Goethe still remembered from his student days, nor the physical compendia that he asked for advice, proved to be fruitful for his purpose. "Like the rest of the world, I was convinced that all colors were contained in light; I had never been told otherwise and had never found the slightest reason to doubt it, because I was not interested in the matter" ("Konfession des Verfassers", Kürschner, vol. 36/2). But when he began to be interested, he found that he could develop nothing for his purpose from this view. The founder of this view, which Goethe found prevalent among natural scientists and which still occupies the same position today, is Newton. It claims that white light, as it emanates from the sun, is composed of colored lights. The colors are created by separating the individual components from the white light. If you allow sunlight to enter a dark room through a small round opening and catch it on a white screen placed vertically against the direction of the incident light, you obtain a white image of the sun. If you place a glass prism between the opening and the screen, through which the light shines, the white round image of the sun changes. It appears shifted, elongated and colored. This image is called the solar spectrum. If the prism is positioned so that the upper parts of the light have a shorter path within the glass mass than the lower parts, the colored image is shifted downwards. The upper edge of the image is red, the lower violet; the red fades downwards into yellow, the violet upwards into blue; the middle part of the image is generally white. Only at a certain distance of the screen from the prism does the white in the middle disappear completely; the whole image appears colored, namely from top to bottom in the following sequence: red, orange, yellow, green, light blue, indigo, violet. From this experiment, Newton and his followers concluded that the colors were originally contained in the white light, but were mixed together. They are separated from each other by the prism. They have the property of being deflected from their direction, i.e. refracted, to different degrees when passing through a transparent body. Red light is refracted the least, violet the most. They appear in the spectrum in order of their refractive power. If you look at a narrow strip of paper on a black background through the prism, it also appears deflected. It is both wider and colored at its edges. The upper edge appears violet, the lower red; here too the violet fades into blue, the red into yellow; the center is generally white. Only at a certain distance of the prism from the stripe does it appear completely colored. The green appears again in the center. Here, too, the white of the strip of paper should be broken down into its colored components. The Newtonians explain simply that only at a certain distance of the screen or strip from the prism do all colors appear, while otherwise the middle is white. They say: in the center, the more strongly deflected lights from the upper part of the image coincide with the less strongly deflected lights from the lower part and mix to form white. Only at the edges do the colors appear, because no more strongly deflected light from above can fall into the most weakly deflected parts and no more weakly deflected light from below can fall into the most strongly deflected parts.
[ 3 ] This is the view from which Goethe can develop nothing for his purpose. He therefore wants to observe the phenomena himself. He turned to Privy Councillor Büttner in Jena, who lent him the apparatus with which he could carry out the necessary experiments. He is initially occupied with other work and, at Büttner's insistence, wants to return the apparatus. Before doing so, he takes a prism to look through it at a completely whitewashed wall. He expects it to appear colored in different shades. But it remains white. Colors only appear where the white meets the dark. The window bars appear in the most vivid colors. From these observations Goethe believes that Newton's view is wrong, that colors are not contained in white light. The boundary, the dark, must have something to do with the emergence of colors. He continued the experiments. White areas on a black background and black areas on a white background are observed. Gradually he forms his own view. A white disk on a black background appears shifted when viewed through the prism. According to Goethe, the upper parts of the disk are pushed over the adjacent black background, while this background extends over the lower parts of the disk. If you now look through the prism, you can see the black ground through the upper part of the disk as if through a white veil. If you look at the lower part of the disc, it shines through the superimposed darkness. At the top, a light is superimposed over a dark; at the bottom, a dark is superimposed over a light. The upper edge appears blue, the lower yellow. The blue changes to violet towards the black; the yellow changes to red towards the bottom. If the prism is removed from the observed disc, the colored edges widen; the blue downwards, the yellow upwards. At a sufficient distance, the yellow from below overlaps the blue from above; the overlapping creates green in the middle. To confirm this view, Goethe looks at a black disk on a white background through the prism. Now a dark color is passed over a light color at the top and a light color over a dark color at the bottom. Yellow appears at the top, blue at the bottom. When the edges are widened by removing the prism from the disc, the blue at the bottom, which gradually changes to violet towards the center, is passed over the yellow at the top, which gradually takes on a red tone as it widens. The result is peach blossom in the middle. Goethe said to himself: what is true for the white disk must also be true for the black one. "If the light there dissolves into so many different colors ... the darkness here must also be regarded as dissolved into colors." ("Konfession des Verfassers", Kürschner, Vol. 36/2.) Goethe now shared his observations and the misgivings he had about Newton's view with a physicist he knew. The latter declared the doubts to be unfounded. He deduced the colored edges and the white in the middle, as well as its transition to green, at a proper distance of the prism from the observed object, in the sense of Newton's view. Other naturalists to whom Goethe put the matter were similar. He continued the observations, for which he would have liked to have had the help of knowledgeable experts, on his own. He had a large prism assembled from mirror disks, which he filled with pure water. Because he noticed that the glass prisms, whose cross-section is an equilateral triangle, are often obstructive to the observer due to the strong broadening of the color appearance, he had his large prism given the cross-section of an isosceles triangle, whose smallest angle is only fifteen to twenty degrees. Goethe calls the experiments that are carried out in such a way that the eye looks through the prism at an object subjective. They present themselves to the eye, but are not fixed in the external world. He wants to add objective ones to these. To do this, he uses the water prism. The light shines through a prism, and behind the prism the color image is captured on a screen. Goethe now lets the sunlight pass through the openings of cut-out cardboard. The result is an illuminated space surrounded by darkness. This limited mass of light passes through the prism and is deflected from its direction by it. If a screen is held up to the mass of light coming out of the prism, an image is formed on it which is generally colored at the top and bottom edges. If the prism is positioned so that its cross-section narrows from top to bottom, the upper edge of the image is colored blue and the lower edge yellow. The blue changes to violet towards the dark space and to light blue towards the light center; the yellow changes to red towards the darkness. Goethe also derives the color appearance of this phenomenon from the border. At the top, the bright mass of light radiates into the dark space; it illuminates a dark area, which thus appears blue. Below, the dark space radiates into the light mass; it darkens a light and makes it appear yellow. By removing the screen from the prism, the edges of the colors become wider, the yellow approaches the blue. By shining the blue into the yellow, green appears in the center of the picture when the screen is sufficiently removed from the prism. Goethe visualizes the radiation of the light into the dark and the dark into the light by creating a fine white cloud of dust in the line in which the mass of light passes through the dark space, which he produces with fine dry hair powder. "The more or less colored appearance is now caught by the white atoms and presented to the eye in its entire width and length." (Farbenlehre, didaktischer Teil § 326.) Goethe finds his view, which he gained from the subjective phenomena, confirmed by the objective ones. Colors are produced by the interaction of light and dark. The prism only serves to push light and dark over one another.
[ 4 ] After making these experiments, Goethe cannot adopt the Newtonian view as his own. His approach to it is similar to that of Haller's theory of nesting. Just as the latter thinks the formed organism with all its parts already contained in the germ, so the Newtonians believe that the colors which appear in the light under certain conditions are already enclosed in it. He could use the same words against this belief that he used against the nesting doctrine, that it "is based on a mere extra-sensory imagination, on an assumption that one believes to think, but can never represent in the world of the senses." Cf. the essay on K. Fr. Wolff, Kürschner, vol. 33.) For him, colors are new formations that are developed in the light, not entities that are merely unwound from the light. Because of his "way of thinking in accordance with the idea" he must reject the Newtonian view. This does not recognize the essence of the ideal. It only recognizes what actually exists. What exists in the same way as the sensually perceptible. And where it cannot prove actuality through the senses, it assumes it hypothetically. Because the colors develop in the light, and must therefore according to the idea already be contained in it, it believes that they are also actually, materially contained in it and are only brought out by the prism and the dark outline. Goethe knows that the idea is active in the world of the senses; therefore he does not transfer something that is present as an idea into the realm of the actual. The ideal works in inorganic nature just as it does in organic nature, only not as a sensuous-supersensible form. Its outer appearance is entirely material, merely sensual. It does not penetrate the sensual; it does not spiritualize it. The processes of inorganic nature proceed according to law, and this lawfulness presents itself to the observer as an idea. If one perceives white light at one point in space and colors arising at another, there is a lawful connection between the two perceptions that can be presented as an idea. But if someone embodies this idea and transposes it into space as an actuality, which moves from the object of one perception into that of the other, this arises from a gross sensory mode of perception. It is this gross sensuality that repels Goethe from the Newtonian view. It is the idea that leads one inorganic process into another, not an actuality that moves from one to the other.
[ 5 ] The Goethean worldview can only recognize two sources for all knowledge of inorganic natural processes: that which is sensually perceptible in these processes, and the ideal connections of the sensually perceptible that reveal themselves to thought. The ideal connections within the sensory world are not of the same kind. There are those that are immediately obvious when sensory perceptions occur side by side or one after the other, and others that can only be seen through when they are traced back to those of the first kind. In the appearance that presents itself to the eye when it looks at a dark through a light and perceives blue, Goethe believes he recognizes a connection of the first kind between light, darkness and color. It is the same when light is seen through dark and produces yellow. The peripheral phenomena of the spectrum reveal a connection that becomes clear through direct observation. The spectrum, which shows seven colors from red to violet in a gradual sequence, can only be understood if you can see how other colors are added to the conditions that create the marginal phenomena. The simple marginal phenomena have combined in the spectrum to form a complicated phenomenon that can only be understood if it is derived from the basic phenomena. What stands before the observer in its purity in the basic phenomenon appears impure, modified by the added conditions in the complicated phenomenon. The simple facts are no longer immediately recognizable. Goethe therefore seeks to trace the complicated phenomena everywhere back to the simple, pure ones. In this reduction he sees the explanation of inorganic nature. He goes no further from the pure phenomenon. It reveals an ideal connection between sensory perceptions that is self-explanatory. Goethe calls the pure phenomenon the primal phenomenon. He considers it moderate speculation to think further about the primordial phenomenon. "The magnet is a primordial phenomenon that one may only pronounce in order to have explained it." (Proverbs in Prose, Kürschner, vol. 36.) A composite phenomenon is explained when one shows how it is built up from primordial phenomena.
[ 6 ] Modern natural science takes a different approach to Goethe. It wants to trace the processes in the sensory world back to the movements of the smallest parts of the body and uses the same laws to explain these movements by which it understands the movements that take place visibly in space. Explaining these visible movements is the task of mechanics. If the movement of a body is observed, mechanics asks: By what force has it been set in motion; what path does it cover in a given time; what is the shape of the line in which it moves, etc. The relationships between the force, the distance traveled and the shape of the path are represented mathematically. Now the naturalist says: The red light can be traced back to an oscillating movement of the smallest parts of the body, which propagates in space. This movement is understood by applying the laws of mechanics to it. The science of inorganic nature regards it as its goal to gradually transition completely into applied mechanics.
[ 7 ] Modern physics asks for the number of oscillations in a unit of time that correspond to a certain color quality. From the number of vibrations that correspond to red and those that correspond to violet, it seeks to determine the physical relationship between the two colors. The qualitative aspect disappears before her eyes; she observes the spatial and temporal aspects of the processes. Goethe asks: What is the connection between red and violet if one disregards the spatial and temporal and only considers the qualitative aspects of the colors? Goethe's way of looking at things presupposes that the qualitative is really also present in the external world and is an inseparable whole with the temporal and spatial. Modern physics, on the other hand, must proceed from the basic assumption that only the quantitative, lightless and colorless processes of movement are present in the external world, and that everything qualitative only arises as an effect of the quantitative on the organism endowed with sense and spirit. If this assumption were correct, then the lawful connections of the qualitative could not be sought in the external world, but had to be derived from the nature of the sensory organs, the nervous system and the organ of imagination. The qualitative elements of the processes would then not be the subject of physical investigation, but of physiological and psychological investigation. Modern natural science proceeds according to this premise. In its view, the organism translates one movement process into the sensation of red, another into that of violet, according to the arrangement of its eyes, its optic nerve and its brain. Therefore, everything external to the world of color is explained once one has understood the connection between the processes of movement that determine this world.
[ 8 ] Proof of this view is sought in the following observation. The optic nerve perceives every external impression as a sensation of light. Not only light, but also a bump or pressure on the eye, a strain on the retina when the eye moves rapidly, an electric current passing through the head: all these things cause light perception. The same things are felt by another sense in a different way. Shock, pressure, strain, electric current, when they excite the skin, cause tactile sensations. Electricity excites a sensation of hearing in the ear and a sensation of taste on the tongue. From this it can be concluded that the sensory content that occurs in the organism as a result of an external influence is different from the external process that causes it. The red color is not perceived by the organism because it is bound to a corresponding process of movement outside in space, but because the eye, optic nerve and brain of the organism are set up in such a way that they translate a colorless process of movement into a color. The law expressed here was called the law of specific sensory energies by the physiologist Johannes Müller, who first established it.
[ 9 ] The above observation only proves that the sensory and mentally gifted organism can translate the most diverse impressions into the language of the senses on which they are exerted. However, it does not prove that the content of every sensory sensation is only present within the organism. When the optic nerve is strained, an indefinite, quite general excitement arises which contains nothing that causes its content to be transferred into space. A sensation that arises from a real impression of light is inseparably connected in content with the spatio-temporal that corresponds to it. The movement of a body and its color are perceptual content in quite the same way. When we imagine the movement for ourselves, we abstract from what else we perceive about the body. Like movement, all other mechanical and mathematical concepts are taken from the world of perception. Mathematics and mechanics arise from the fact that a part of the content of the world of perception is separated out and considered in its own right. In reality there are no objects or processes whose content is exhausted when one has understood what can be expressed by mathematics and mechanics. Everything mathematical and mechanical is bound to color, heat and other qualities. If it is necessary for physics to assume that the perception of a color corresponds to vibrations in space, which have a very small extension and a very great speed, then these movements can only be thought of as analogous to the movements that occur visibly in space. In other words, if the physical world is conceived as moving down to its smallest elements, then it must also be conceived as endowed with color, warmth and other properties down to its smallest elements. Whoever conceives of colors, warmth, sounds, etc., as qualities that exist only within the imagining organism as effects of external processes, must also transfer everything mathematical and mechanical that is connected with these qualities to this interior. But then he has nothing left for his outer world. The red that I see and the light vibrations that the physicist proves to correspond to this red are in reality a unity that only the abstracting mind can separate from each other. I would see the vibrations in space, which correspond to the quality "red", as movement if my eye were organized for it. But I would have the impression of the red color in connection with the movement.
[ 10 ] Modern natural science transposes an unreal abstract, a vibrating substrate stripped of all sensory qualities into space and wonders why it is impossible to understand what can cause the imaginative organism, equipped with nervous apparatus and brain, to translate these indifferent processes of movement into the colorful world of the senses, interspersed with degrees of warmth and tones. Du Bois-Reymond therefore assumes that man will never understand how the fact: "I taste sweetness, smell the scent of roses, hear the sound of an organ, see red" is connected with certain movements of the smallest parts of the body in the brain, which movements are in turn caused by the vibrations of the tasteless, odorless, soundless and colorless elements of the outer body world. "It is absolutely and forever incomprehensible that a number of carbon, hydrogen, nitrogen, oxygen, etc. atoms should not be indifferent to each other. atoms should not be indifferent to how they lie and move, how they lay and moved, how they will lie and move." ("Grenzen des Naturerkennens", Leipzig 1882, p.33f.) However, there is absolutely no limit to knowledge here. Where there is a number of atoms in a certain movement in space, there is necessarily also a certain quality (e.g. red). And vice versa, where red occurs, motion must be present. Only abstract thinking can separate the one from the other. Anyone who thinks of movement as separate from the rest of the content of the process to which the movement belongs in reality cannot find the transition from one to the other.
[ 11 ] Only what is movement in a process can be derived from movement; what belongs to the qualitative world of color and light can also only be traced back to a similar qualitative within the same field. Mechanics traces compound movements back to simple ones that are immediately comprehensible. Color theory must trace complicated color phenomena back to simple ones that can be understood in the same way. A simple process of movement is just as much a primordial phenomenon as the emergence of yellow from the interaction of light and dark. Goethe knows what the mechanical primal phenomena can do for the explanation of inorganic nature. What is not mechanical within the physical world, he traces back to primordial phenomena that are not mechanical. Goethe has been reproached for rejecting the mechanical view of nature and limiting himself to the observation and juxtaposition of the sensible and vivid. Cf. e.g. Harnack in his book "Goethe in der Epoche seiner Vollendung", p. 12) Du Bois-Reymond finds ("Goethe und kein Ende", Leipzig 1883, p.29): "Goethe's theorizing is limited to allowing other phenomena to emerge from a primal phenomenon, as he calls it, such as one nebulous image follows another, without any plausible causal connection. It was the concept of mechanical causality that Goethe completely missed." But what does mechanics do other than allow complex processes to emerge from simple primordial phenomena? Goethe did exactly the same in the field of the world of color as the mechanic does in the field of motion processes. Because Goethe is not of the opinion that all processes in inorganic nature are purely mechanical, the concept of mechanical causality has been denied him. Whoever does this only shows that he himself is mistaken about what mechanical causality means within the physical world. Goethe remains within the qualitative aspects of the world of light and color; he leaves the quantitative, mechanical aspects, which are to be expressed mathematically, to others. He "has sought to keep the theory of color quite distant from mathematics, even though certain points arise clearly enough where the aid of the art of measurement would be desirable ... But even this deficiency may be an advantage, since it can now become the business of the ingenious mathematician to find out for himself where color theory needs his help and how he can contribute to the completion of this part of natural science." (§ 727 of the didactic part of the Theory of Colors.) The qualitative elements of the sense of sight: light, darkness, colors must first be understood from their own contexts, traced back to primordial phenomena; then, at a higher level of thinking, the relationship between these contexts and the quantitative, the mechanical-mathematical in the world of light and color can be investigated.
[ 12 ] The connections within the qualitative aspects of the world of color Goethe wants to trace back to the simplest elements in the same strict sense as the mathematician or mechanic does in his field. We have to learn from the mathematicians the "thoughtfulness of merely stringing together the next to the next, or rather of deducing the next from the next, and even where we make no use of a calculation, we must always proceed as if we owed an account to the most rigorous geometrician. - For it is actually the mathematical method which, on account of its deliberateness and purity, immediately reveals every leap in the assertion, and its proofs are really only circumstantial explanations that what is put forward in connection has already been there in its simple parts and in its whole sequence, has been overlooked in its whole scope and has been invented correctly and irrefutably under all conditions." (" Der Versuch als Vermittler von Subjekt und Objekt" Kürschner, vol. 34).
[ 13 ] Goethe takes the explanatory principles for phenomena directly from the realm of observation. He shows how phenomena are connected within the tangible world. He rejects ideas that point beyond the field of observation for the conception of nature. All types of explanation that transcend the field of experience by invoking factors for the explanation of nature that are not observable by their nature contradict Goethe's world view. One such type of explanation is that which seeks the essence of light in a luminous substance which as such cannot be perceived, but can only be observed in its mode of action as light. Also among these types of explanation is the one prevailing in modern natural science, according to which the processes of movement in the world of light are not carried out by the perceptible qualities given to the sense of sight, but by the smallest parts of the imperceptible substance. It does not contradict Goethe's view of the world to imagine that a certain color is connected with a certain process of movement in space. But it certainly contradicts it if it is claimed that this process of movement belongs to a realm of reality outside of experience, the world of matter, which can be observed in its effects but not in its own essence. For a follower of Goethe's world view, the oscillations of light in space are processes that have no other kind of reality than the rest of the content of perception. They elude direct observation not because they lie beyond the realm of experience, but because the human sense organs are not so finely organized that they can directly perceive movements of such smallness. If an eye were so organized that it could still observe in detail the swinging to and fro of an object that repeats itself four hundred trillion times in one second, such a process would present itself in exactly the same way as one of the gross sensory world. In other words, the vibrating thing would exhibit the same properties as other perceptual things.
[ 14 ] Any kind of explanation that derives the things and processes of experience from others that are not located within the field of experience can only arrive at substantive ideas of this realm of reality that lies beyond observation by borrowing certain properties from the world of experience and transferring them to the inexperient. Thus the physicist transfers hardness and impenetrability to the smallest physical elements, to which he also ascribes the ability to attract and repel their equals; on the other hand, he does not attribute color, warmth and other properties to these elements. He believes he can explain a tangible process of nature by tracing it back to a non-experiential one. In Du Bois-Reymond's view, recognizing nature means tracing the processes in the physical world back to the movements of atoms, which are caused by their attractive and repulsive forces ("Grenzen des Naturerkennens", Leipzig 1882, p. 10). Matter, the substance that fills space, is assumed to be the moving element. This substance is said to have existed from eternity and will continue to exist for all eternity. Matter, however, is not supposed to belong to the realm of observation, but to exist beyond it. Du Bois-Reymond therefore assumes that man is incapable of recognizing the nature of matter itself, that he therefore attributes the processes of the physical world to something whose nature will always remain unknown to him. "We will never know better than we do today what is haunting space, where matter is." ("Grenzen des Naturerkennens", p.22.) Before a precise consideration, this concept of matter dissolves into nothing The real content that one gives to this concept is borrowed from the world of experience. One perceives movements within the world of experience. You feel a pull when you hold a weight in your hand and a push when you place a weight on your horizontally held palm. To explain this perception, we form the concept of force. Imagine that the earth attracts the weight. The force itself cannot be perceived. It is ideal. But it does belong to the field of observation. The mind observes it because it observes the ideal relationships between perceptions. One is led to the concept of a repulsive force if one squeezes a piece of rubber and then leaves it to itself. It restores itself to its former shape and size. One imagines that the compressed parts of the rubber repel each other and regain their former volume. Such ideas, drawn from observation, are transferred to the unperceivable realm of reality. In reality, therefore, it does nothing more than derive one experienceable thing from another experienceable thing. It only arbitrarily transfers the latter into the realm of the unperceivable. Every mode of conception that speaks of an unperceivable within the view of nature must be shown to take some lobes from the realm of experience and refer them to a realm of reality beyond observation. If one removes the lobes of experience from the concept of the inconceivable, what remains is a concept without content, a non-concept. The explanation of an experience can only consist in tracing it back to another experience. Finally, one arrives at elements within experience that can no longer be traced back to others. These cannot be explained further because they do not require any explanation. They contain their explanation within themselves. Their immediate essence consists in what they offer to observation. For Goethe, one such element is light. In his view, light is recognized by those who perceive it impartially in its appearance. Colors arise from light and their emergence is understood when one shows how they arise from it. Light itself is given in direct perception. What is ideally determined in it can be recognized by observing the connection between it and the colors. To ask about the essence of light, about an inexperience that corresponds to the phenomenon of "light", is impossible from the point of view of Goethe's world view. "For we actually undertake to express the essence of a thing in vain. We become aware of effects, and a complete history of these effects would at best encompass the essence of that thing." That is to say, a complete representation of the effects of an experiencable comprises all phenomena that are ideally predisposed in it. "In vain do we endeavor to portray the character of a man; but put together his actions, his deeds, and a picture of character will confront us. - The colors are deeds of light, deeds and suffering. In this sense, we can expect them to provide us with information about light." (Didactic part of the Theory of Colors. Preface.)
[ 15 ] Light presents itself to observation as "the simplest, most undissected, most homogeneous being that we know." (Correspondence with Jacobi, p. 167.) Opposed to it is darkness. For Goethe, darkness is not the completely powerless absence of light. It is something effective. It opposes the light and interacts with it. Modern natural science sees darkness as a complete nothingness. According to this view, the light that streams into a dark room has no resistance from the darkness to overcome. Goethe imagines that light and darkness relate to each other like the north and south poles of a magnet. Darkness can weaken the power of light. Conversely, light can limit the energy of darkness. In both cases, color is created. A physical view that thinks of darkness as something completely ineffective cannot speak of such an interaction. It must therefore derive color from light alone. Darkness appears to the observer just as much as light. Darkness is the content of perception in the same sense as light. The one is only the opposite of the other. The eye that looks out into the night conveys the real perception of darkness. If darkness were absolute nothingness, there would be no perception at all when a person looks out into the darkness.
[ 16 ] The yellow is light attenuated by darkness; the blue is darkness attenuated by light.
[ 17 ] The eye is designed to convey the phenomena of the world of light and color and the relationships between these phenomena to the imagining organism. In doing so, it does not merely absorb, but enters into lively interaction with the phenomena. Goethe strives to recognize the nature of this interaction. He regards the eye as a living thing and wants to see through its vital manifestations. How does the eye relate to the individual phenomenon? How does it relate to the relationships between the phenomena? These are the questions he asks himself. Light and darkness, yellow and blue are opposites. How does the eye perceive these opposites? It must be in the nature of the eye that it also perceives the interrelationships that exist between the individual perceptions. For "the eye owes its existence to the light. From indifferent animal auxiliary organs, light calls forth an organ that becomes its equal; and thus the eye forms itself for light by light, so that the inner light confronts the outer light." (Didactic part of the Theory of Colors. Introduction.)
[ 18 ] Just as light and darkness are opposed to each other in external nature, so the two states into which the eye is placed by the two phenomena are opposed to each other. If the eye is kept open in a dark room, a certain lack of light becomes perceptible. If, on the other hand, it is turned towards a strongly illuminated white surface, it becomes incapable of distinguishing moderately illuminated objects for a certain period of time. Seeing into the dark increases sensitivity; seeing into the light weakens it.
[ 19 ] Every impression on the eye remains in it for a time. If you look at a black window cross on a light background, when you close your eyes you will still have the impression in front of you for a while. If you look at a light gray surface while the impression is still lasting, the cross appears light and the window space dark. The appearance is reversed. It follows that the eye is disposed by one impression to produce the opposite impression from itself. Just as light and darkness are related to each other in the outside world, so are the corresponding states in the eye. Goethe imagines that the place in the eye on which the dark cross fell is rested and receptive to a new impression. That is why the gray area has a more vivid effect on him than on the other places in the eye that previously received the stronger light from the window panes. Light causes the eye to lean towards dark; dark towards light. If you hold a dark image in front of a light gray surface and look at the same spot without looking at it, the space occupied by the dark image appears much brighter than the rest of the surface. A gray image on a dark background appears brighter than the same image on a light background. The eye is predisposed by the dark ground to see the picture brighter; by the light ground to see it darker. Goethe is reminded by these phenomena of the great responsiveness of the eye "and the silent contradiction that every living thing is compelled to express when it is presented with any particular state. Thus inhalation presupposes exhalation and vice versa... It is the eternal formula of life that is also expressed here. Just as the eye is offered the dark, so it demands the light; it demands the dark when it is offered the light and thereby shows its vitality, its right to grasp the object, by bringing forth from itself something that is opposed to the object." (§ 38 of the didactic part of the Theory of Colors.)
[ 20 ] In a similar way to light and darkness, color perceptions also evoke a counter-effect in the eye. Hold a small piece of yellow-colored paper in front of a moderately illuminated white board and look at the small yellow area without changing your gaze. After a while, lift the paper away. You will see that the area which the paper has filled is purple. The eye is predisposed by the impression of the yellow to produce the violet from itself. In the same way, the blue will produce the orange, the red the green as a counter-effect. Each color sensation therefore has a living relationship to another in the eye. The states into which the eye is placed by perceptions are related in a similar way to the contents of these perceptions in the outside world.
[ 21 ] When light and darkness, light and dark act on the eye, this living organ confronts them with its demands; if they act on the things outside in space, these interact with them. Empty space has the property of transparency. It has no effect at all on light and darkness. These shine through it in their own vividness. It is different when the space is filled with things. This filling can be such that the eye is not aware of it because light and darkness shine through it in their original form. Then one speaks of transparent things. If light and darkness do not shine through a thing undiminished, it is called cloudy. The cloudy filling of space offers the possibility of observing light and darkness, light and dark in their mutual relationship. A light seen through a cloudy space appears yellow, a dark blue. The cloudy is a material thing that is illuminated by the light. Compared to a brighter, more vivid light behind it, the cloudy is dark; compared to a translucent darkness, it behaves as light. Thus, when a cloudy object opposes light or darkness, an existing light and an equally dark object really interact.
[ 22 ] If the cloudiness through which the light shines gradually increases, the yellow changes to yellow-red and then to ruby-red. If the opacity through which the dark penetrates decreases, the blue changes to indigo and finally to violet. Yellow and blue are primary colors. They are created by the interaction of the light or dark with the cloudy color. Both can take on a reddish tone, the former by increasing, the latter by reducing the cloudiness. Red is therefore not a basic color. It appears as a hue next to the yellow or blue. Yellow with its reddish nuances, which increase to pure red, is close to light, blue with its shades is related to darkness. When blue and yellow mix, the result is green; when blue, which is intensified to violet, mixes with yellow, which is darkened to red, the result is purple.
[ 23 ] Goethe traces these basic phenomena within nature. The bright disk of the sun seen through a pile of cloudy vapours appears yellow. Dark outer space, seen through the vapors of the atmosphere illuminated by daylight, appears as the blue of the sky. "In the same way the mountains also appear blue to us: for when we see them at such a distance that we no longer see the local colors, and no light from their surface affects our eye, they are regarded as a pure dark object, which now appears blue through the intervening vapors." (§ 156 of the didactic part of the Theory of Colors.)
[ 24 ] From his immersion in the works of art of the painters, Goethe felt the need to penetrate the laws to which the phenomena of the sense of sight are subject. Every painting posed a riddle for him. How does the chiaroscuro relate to the colors? What is the relationship between the individual colors? Why does yellow create a cheerful mood and blue a serious one? Newton's theory of color did not provide a point of view from which these mysteries could be unraveled. It derives all colors from light, juxtaposes them in stages and says nothing about their relationship to the dark, nor about their living relationships to one another. Goethe was able to solve the riddles that art had given him from the insights he had gained on his own. Yellow must possess a cheerful, lively, gently charming quality, for it is the closest color to light. It arises from the mildest moderation of it. Blue points to the dark that is at work in it. That is why it gives a feeling of coldness, just as "it also reminds us of shadows". The reddish yellow is created by increasing the yellow on the side of the dark. This intensification increases its energy. The cheerful, cheerfulness merges into the blissful. As soon as the increase goes even further, from reddish yellow to yellowish red, the cheerful, blissful feeling is transformed into an impression of violence. The violet is the blue striving towards the light. The calm and coldness of the blue thus becomes restlessness. This restlessness is further intensified in the blue-red. The pure red stands in the middle between yellow-red and blue-red. The storminess of the yellow appears diminished, the casual calm of the blue is revitalized. The red gives the impression of ideal satisfaction, the balancing of opposites. A feeling of satisfaction is also created by the green, which is a mixture of yellow and blue. But because the cheerfulness of the yellow is not heightened here and the calm of the blue is not disturbed by the reddish tone, the satisfaction will be purer than that produced by the red.
[ 25 ] When the eye is confronted with one color, it immediately demands another. If it sees yellow, it longs for violet; if it perceives blue, it desires orange; if it sees red, it desires green. It is understandable that the feeling of satisfaction arises when, next to one color presented to the eye, another is placed which it naturally desires. The law of color harmony arises from the nature of the eye. Colors that the eye demands next to each other appear harmonious. If two colors appear side by side, one of which does not demand the other, the eye is stimulated to counteract them. The combination of yellow and purple has something one-sided, but cheerful and splendid about it. The eye wants violet next to yellow in order to be able to express itself naturally. If purple takes the place of violet, the object asserts its claims against those of the eye. It does not submit to the demands of the organ. Compositions of this kind serve to point out the significance of things. They are not necessarily intended to satisfy, but to characterize. Colors that are not in complete contrast to one another, but which do not merge directly into one another, are suitable for such characteristic combinations. Compositions of the latter kind give the things in which they occur something characterless.
[ 26 ] The becoming and essence of light and color phenomena was revealed to Goethe in nature. He also recognized it in the creations of painters, in which it is raised to a higher level, translated into the spiritual. Goethe gained a deep insight into the relationship between nature and art through his observations of facial perceptions. He may well have been thinking of this when he wrote to Frau von Stein about these observations after completing the "Theory of Colors": "I am not sorry to have devoted so much time to them. I have thereby attained a culture that I would have found difficult to obtain from any other source."
[ 27 ] Goethe's theory of color is different from that of Newton and those physicists who base their views on Newton's ideas, because the former proceeds from a different world view than the latter. Anyone who does not see the connection between Goethe's general conceptions of nature and his theory of color, as described here, cannot help but believe that Goethe arrived at his conceptions of color because he lacked a sense for the physicist's genuine methods of observation. Anyone who sees through this connection will also realize that no other theory of color is possible within Goethe's view of the world than his own. He could not have thought differently about the nature of color phenomena than he did, even if all the discoveries made in this field since his time had been laid out before him, and even if he himself had been able to use the experimental methods that are now so perfected. Even if, after he became acquainted with the discovery of Fraunhofer's lines, he could not fully integrate them into his view of nature, neither they nor any other discovery in the optical field would be an objection to his view. In all this it is only a question of developing this Goethean conception in such a way that these phenomena fit into it in their sense. It must be admitted that those who stand on the point of view of Newton's conception cannot imagine anything in Goethe's views of color. However, this is not because such a physicist is familiar with phenomena that contradict Goethe's view, but because he has become accustomed to a view of nature that prevents him from recognizing what Goethe's view of nature actually wants.