Reference was made in an antecedent essay to an art of light of mobile color an abstract language of thought and emotion which should speak to consciousness through the eye, as music speaks through the ear. This is an art unborn, though quickening in the womb of the future. The things that reflect light have been organized aesthetically into the arts of architecture, painting, and sculpture, but light itself has never been thus organized.

And yet the scientific development and control of light has reached a stage which makes this new art possible. It awaits only the advent of the creative artist. The manipulation of light is now in the hands of the illuminating engineers and its exploitation (in other than necessary ways) in the hands of the advertisers.

Some results of their collaboration are seen in the sky signs of upper Broadway, in New York, and of the lake front, in Chicago. A carnival of contending vulgarities, showing no artistry other than the most puerile, these displays nevertheless yield an effect of amazing beauty. This is on account of an occult property inherent in the nature of light it cannot be vulgarized. If the manipulation of light were delivered into the hands of the artist, and dedicated to noble ends, it is impossible to overestimate the augmentation of beauty that would ensue.

For light is a far more potent medium than sound. The sphere of sound is the earth-sphere; the little limits of our atmosphere mark the uttermost boundaries to which sound, even the most strident can possibly prevail. But the medium of light is the ether, which links us with the most distant stars. May not this serve as a symbol of the potency of light to usher the human spirit into realms of being at the doors of which music itself shall beat in vain? Or if we compare the universe accessible to sight with that accessible to sound the plight of the blind in contrast to that of the deaf there is the same discrepancy; the field of the eye is immensely richer, more various and more interesting than that of the ear.

The difficulty appears to consist in the inferior impressionability of the eye to its particular order of beauty. To the average man color as color has nothing significant to say: to him grass is green, snow is white, the sky blue; and to have his attention drawn to the fact that sometimes grass is yellow, snow blue, and the sky green, is disconcerting rather than illuminating. It is only when his retina is assaulted by some splendid sunset or sky-encircling rainbow that he is able to disassociate the idea of color from that of form and substance. Even the artist is at a disadvantage in this respect, when compared with the musician. Nothing in color knowledge and analysis analogous to the established laws of musical harmony is part of the equipment of the average artist; he plays, as it were, by ear. The scientist, on the other hand, though he may know the spectrum from end to end, and its innumerable modifications, values this “rainbow promise of the Lord” not for its own beautiful sake but as a means to other ends than those of beauty. But just as the art of music has developed the ear into a fine and sensitive instrument of appreciation, so an analogous art of light would educate the eye to nuances of color to which it is now blind.

It is interesting to speculate as to the particular form in which this new art will manifest itself. The question is perhaps already answered in the “color organ,” the earliest of which was Bambridge Bishop’s, exhibited at the old Barnum’s Museum before the days of electric light and the latest A.W. Rimington’s. Both of these instruments were built upon a supposed correspondence between a given scale of colors, and the musical chromatic scale; they were played from a musical score upon an organ keyboard. This is sufficiently easy and sufficiently obvious, and has been done, with varying success in one way or another, time and again, but its very ease and obviousness should give us pause.

It may well be questioned whether any arbitrary and literal translation, even though practicable, of a highly complex, intensely mobile art, unfolding in time, as does music, into a correspondent light and color expression, is the best approach to a new art of mobile color. There is a deep and abiding conviction, justified by the history of aesthetics, that each art-form must progress from its own beginnings and unfold in its own unique and characteristic way. Correspondences between the arts such a correspondence, for example, as inspired the famous saying that architecture is frozen music reveal themselves usually only after the sister arts have attained an independent maturity. They owe their origin to that underlying unity upon which our various modes of sensuous perception act as a refracting medium, and must therefore be taken for granted. Each art, like each individual, is unique and singular; in this singularity dwells its most thrilling appeal. We are likely to miss light’s crowning glory, and the rainbow’s most moving message to the soul if we preoccupy ourselves too exclusively with the identities existing between music and color; it is rather their points of difference which should first be dwelt upon.

Let us accordingly consider the characteristic differences between the two sense-categories to which sound and light music and color respectively belong. This resolves itself into a comparison between time and space. The characteristic thing about time is succession hence the very idea of music, which is in time, involves perpetual change. The characteristic of space, on the other hand, is simultaneousness in space alone perpetual immobility would reign. That is why architecture, which is pre-eminently the art of space, is of all the arts the most static. Light and color are essentially of space, and therefore an art of mobile colour should never lack a certain serenity and repose. A “tune” played on a color organ is only distressing. If there is a workable correspondence between the musical art and an art of mobile color, it will be found in the domain of harmony which involves the idea of simultaneity, rather than in melody, which is pure succession. This fundamental difference between time and space cannot be over-emphasized. A musical note prolonged, becomes at last scarcely tolerable; while a beautiful color, like the blue of the sky, we can enjoy all day and every day. The changing hues of a sunset, are andante if referred to a musical standard, but to the eye they are allegretto we would have them pass less swiftly than they do. The winking, chasing, changing lights of illuminated sky-signs are only annoying, and for the same reason. The eye longs for repose in some serene radiance or stately sequence, while the ear delights in contrast and continual change. It may be that as the eye becomes more educated it will demand more movement and complexity, but a certain stillness and serenity are of the very nature of light, as movement and passion are of the very nature of sound. Music is a seeking “love in search of a word”; light is a finding a “divine covenant.”

With attention still focussed on the differences rather than the similarities between the musical art and a new art of mobile color, we come next to the consideration of the matter of form. Now form is essentially of space: we speak about the “form” of a musical composition, but it is in a more or less figurative and metaphysical sense, not as a thing concrete and palpable, like the forms of space. It would be foolish to forego the advantage of linking up form with colour, as there is opportunity to do. Here is another golden ball to juggle with, one which no art purely in time affords. Of course it is known that musical sounds weave invisible patterns in the air, and to render these patterns perceptible to the eye may be one of the more remote and recondite achievements of our uncreated art. Meantime, though we have the whole treasury of natural forms to draw from, of these we can only properly employ such as are abstract. The reason for this is clear to any one who conceives of an art of mobile color, not as a moving picture show a thing of quick-passing concrete images, to shock, to startle, or to charm but as a rich and various language in which light, proverbially the symbol of the spirit, is made to speak, through the senses, some healing message to the soul. For such a consummation, “devoutly to be wished,” natural forms forms abounding in every kind of association with that world of materiality from which we would escape are out of place; recourse must be had rather to abstract forms, that is, geometrical figures. And because the more remote these are from the things of sense, from knowledge and experience, the projected figures of four-dimensional geometry would lend themselves to these uses with an especial grace. Color without form is as a soul without a body; yet the body of light must be without any taint of materiality. Four-dimensional forms are as immaterial as anything that could be imagined and they could be made to serve the useful purpose of separating colors one from another, as lead lines do in old cathedral windows, than which nothing more beautiful has ever been devised.

Coming now to the consideration, not of differences, but similarities, it is clear that a correspondence can be established between the colors of the spectrum and the notes of a musical scale. That is, the spectrum, considered as the analogue of a musical octave can be subdivided into twelve colors which may be representative of the musical chromatic scale of twelve semi-tones: the very word, chromatic, being suggestive of such a correspondence between sound and light. The red end of the spectrum would naturally relate to the low notes of the musical scale, and the violet end to the high, by reason of the relative rapidity of vibration in each case; for the octave of a musical note sets the air vibrating twice as rapidly as does the note itself, and roughly speaking, the same is true of the end colors of the spectrum with relation to the ether.

But assuming that a color scale can be established which would yield a color correlative to any musical note or chord, there still remains the matter of values to be dealt with. In the musical scale there is a practical equality of values: one note is as potent as another. In a color scale, on the other hand, each note (taken at its greatest intensity) has a positive value of its own, and they are all different. These values have no musical correlatives, they belong to color per se. Every colorist knows that the whole secret of beauty and brilliance dwells in a proper understanding and adjustment of values, and music is powerless to help him here. Let us therefore defer the discussion of this musical parallel, which is full of pitfalls, until we have made some examination into such simple emotional reactions as color can be discovered to yield. The musical art began from the emotional response to certain simple tones and combinations, and the delight of the ear in their repetition and variation.

On account of our undeveloped sensitivity, the emotional reactions to color are found to be largely personal and whimsical: one person “loves” pink, another purple, or green. Color therapeutics is too new a thing to be relied upon for data, for even though colors are susceptible of classification as sedative, recuperative and stimulating, no two classifications arrived at independently would be likely to correspond. Most people appear to prefer bright, pure colors when presented to them in small areas, red and blue being the favourites. Certain data have been accumulated regarding the physiological effect and psychological value of different colors, but this order of research is in its infancy, and we shall have recourse, therefore, to theory, in the absence of any safer guide.

One of the theories which may be said to have justified itself in practice in a different field is that upon which is based Delsarte’s famous art of expression. It has schooled some of the finest actors in the world, and raised others from mediocrity to distinction. The Delsarte system is founded upon the idea that man is a triplicity of physical, emotional, and intellectual qualities or attributes, and that the entire body and every part thereof conforms to, and expresses this triplicity. The generative and digestive region corresponds with the physical nature, the breast with the emotional, and the head with the intellectual; “below” represents the nadir of ignorance and dejection, “above” the zenith of wisdom and spiritual power. This seems a natural, and not an arbitrary classification, having interesting confirmations and correspondencies, both in the outer world of form, and in the inner world of consciousness. Moreover, it is in accord with that theosophic scheme derived from the ancient and august wisdom of the East, which longer and better than any other has withstood the obliterating action of slow time, and is even now renascent. Let us therefore attempt to classify the colors of the spectrum according to this theory, and discover if we can how nearly such a classification is conformable to reason and experience.

The red end of the spectrum, being lowest in vibratory rate, would correspond to the physical nature, proverbially more sluggish than the emotional and mental. The phrase “like a red rag to a bull,” suggests a relation between the color red and the animal consciousness established by observation. The “low-brow” is the dear lover of the red necktie; the “high-brow” is he who sees violet shadows on the snow. We “see red” when we are dominated by ignoble passion. Though the color green is associated with the idea of jealousy, it is associated also with the idea of sympathy, and jealousy in the last analysis is the fear of the loss of sympathy; it belongs, at all events to the mediant, or emotional group of colors; while blue and violet are proverbially intellectual and spiritual colors, and their place in the spectrum therefore conforms to the demands of our theoretical division. Here, then, is something reasonably certain, certainly reasonable, and may serve as an hypothesis to be confirmed or confuted by subsequent research. Coming now finally to the consideration of the musical parallel, let us divide a color scale of twelve steps or semi-tones into three groups; each group, graphically portrayed, subtending one-third of the arc of a circle. The first or red group will be related to the physical nature, and will consist of purple-red, red, red-orange, and orange. The second, or green group will be related to the emotional nature, and will consist of yellow, yellow-green, green, and green-blue. The third, or blue group will be related to the intellectual and spiritual nature, and will consist of blue, blue-violet, violet and purple. The merging of purple into purple-red will then correspond to the meeting place of the highest with the lowest, “spirit” and “matter.” We conceive of this meeting-place symbolically as the “heart” the vital centre. Now “sanguine” is the appropriate name associated with the color of the blood a color between purple and purple-red. It is logical, therefore, to regard this point in our color-scale as its tonic “middle C” though each color, just as in music each note, is itself the tonic of a scale of its own.

Mr. Louis Wilson the author of the above “ophthalmic color scale” makes the same affiliation between sanguine, or blood color, and middle C, led thereto by scientific reasons entirely unassociated with symbolism. He has omitted orange-yellow and violet-purple; this makes the scale conform more exactly with the diatonic scale of two tetra-chords; it also gives a greater range of purples, a color indispensable to the artist. Moreover, in the scale as it stands, each color is exactly opposite its true spectral complementary.

The color scale being thus established and broadly divided, the next step is to find how well it justifies itself in practice. The most direct way would be to translate the musical chords recognized and dealt with in the science of harmony into their corresponding color combinations.

For the benefit of such readers as have no knowledge of musical harmony it should be said that the entire science of harmony is based upon the triad, or chord of three notes, and that there are various kinds of triads: the major, the minor, the augmented, the diminished, and the altered. The major triad consists of the first note of the diatonic scale, or tonic; its third, and its fifth. The minor triad differs from the major only in that the second member is lowered a semi-tone. The augmented triad differs from the major only in that the third member is raised a semi-tone. The diminished triad differs from the minor only in that the third member is lowered a semi-tone. The altered triad is a chord different by a semi-tone from any of the above.

The major triad in color is formed by taking any one of the twelve color-centers of the ophthalmic color scale as the first member of the triad; and, reading up the scale, the fifth step (each step representing a semi-tone) determines the second member, while the third member is found in the eighth step. The minor triad in color is formed by lowering the second member of the major triad one step; the augmented triad by raising the third member of the major triad one step, and the diminished triad by lowering the third member of the minor triad one step.

These various triads are shown graphically in Figure 18 as triangles within a circle divided into twelve equal parts, each part representing a semi-tone of the chromatic scale. It is seen at a glance that in every case each triad has one of its notes (an apex) in or immediately adjacent to a different one of the grand divisions of the colour scale hereinbefore established and described, and that the same thing would be true in any “key”: that is, by any variation of the point of departure.

This certainly satisfies the mind in that it suggests variety in unity, balance, completeness, and in the actual portrayal, in color, of these chords in any “key” this judgment is confirmed by the eye, provided that the colors have been thrown into proper harmonic suppression. By this is meant such an adjustment of relative values, or such an establishment of relative proportions as will produce the maximum of beauty of which any given combination is capable. This matter imperatively demands an aesthetic sense the most sensitive.

So this “musical parallel,” interesting and reasonable as it is, will not carry the color harmonist very far, and if followed too literally it is even likely to hamper him in the higher reaches of his art, for some of the musical dissonances are of great beauty in color translation. All that can safely be said in regard to the musical parallel in its present stage of development is that it simplifies and systematizes color knowledge and experiment and to a beginner it is highly educational.

If we are to have color symphonies, the best are not likely to be those based on a literal translation of some musical masterpiece into color according to this or any theory, but those created by persons who are emotionally reactive to this medium, able to imagine in color, and to treat it imaginatively. The most beautiful mobile color effects yet witnessed by the author were produced on a field only five inches square, by an eminent painter quite ignorant of music; while some of the most unimpressive have been the result of a rigid adherence to the musical parallel by persons intent on cutting, with this sword, this Gordian knot.

Into the subject of means and methods it is not proposed to enter, nor to attempt to answer such questions as to whether the light shall be direct or projected; whether the spectator, wrapped in darkness, shall watch the music unfold at the end of some mysterious vista, or whether his whole organism shall be played upon by powerful waves of multi-coloured light. These coupled alternatives are not mutually exclusive, any more than the idea of an orchestra is exclusive of that of a single human voice.

In imagining an art of mobile color unconditioned by considerations of mechanical difficulty or of expense, ideas multiply in truly bewildering profusion. Sunsets, solar coronas, star spectra, auroras such as were never seen on sea or land; rainbows, bubbles, rippling water; flaming volcanoes, lava streams of living light these and a hundred other enthralling and perfectly realizable effects suggest themselves. What Israfil of the future will pour on mortals this new “music of the spheres”?