First of all it should be remembered that the intensity of color should be carefully adjusted to its area. It is dangerous to try to use high, pure colors, unrelieved and uncontrasted, in large masses, but the brightest, strongest colors may be used with safety in units of sufficiently restricted size. For harmony, as well as for richness, the law of complementaries, in its most general application, is the safest of all guides, but it must be followed with fine discrimination. Complementary colors are like married pairs, if they find the right adjustment with one another they are happy—that is, there is an effect of beauty—but lacking such adjustment they are worse off together than apart. Every artist who experiments in color soon finds out for himself that instead of using two colors directly complementary, it is better to "split" one of them, that is, use instead of one of them two others, which combined will yield the color in question. For example, the color complementary to red is green-blue. Now green-blue is equidistant between yellow-green and blue-violet, so if for red and blue-green; red, yellow-green and blue-violet be substituted the combination loses its obviousness and a certain harshness without losing anything of its brilliance, or without departing from the optical law involved. Such a combination corresponds to a diminished triad in music.
Another important consideration with regard to color as employed by the architect dwells in those optical changes effected by distance and position: the relative visibility of different colors and combinations of colors as the spectator recedes from them, and the environmental changes which colors undergo—in bright sunlight, in shadow, against the sky, and with relation to backgrounds of different sorts.
The effect of distance is to make colors merge into one another, to lower the values, but not all equally. Yellow loses itself first, tending toward white. The effect of distance, in general, is to disintegrate and decompose, thus giving "vibration" as it is called. A knowledge of these and kindred facts will save the architect from many disappointments and enable him to obtain wonderful chromatic effects by simple means.
Many architects unused to color problems design their ornament with very little thought about the colors which they propose to employ, making it an after-consideration; but the two things should be considered synchronously for the best final effect. There is a cryptic saying that "color is at right angles to form," that is, color is capable of making surfaces advance toward or recede from the eye, just as modelling does; and for this reason, if color is used, a great deal of modelling may be dispensed with. If a receding color is used on a recessed plane, it deepens that plane unduly; while on the other hand if a color which refuses to recede—like yellow for example—is used where depth is wanted, the receding plane and the approaching color neutralize one another, resulting in an effect of flatness not intended. The tyro should not complicate his problem by combining color with high relief modelling, bringing inevitably in the element of light and shade. He should leave that for older hands and concern himself rather with flat or nearly flat surfaces, using his modelling much as the worker in cloisonné uses his little rims of brass—to confine and define each color within its own allotted area. Then, as he gains experience, he may gradually enrich his pattern by the addition of the element of light and shade, should he so decide.
Now as to certain general considerations in relation to the appropriate and logical use of ceramics in the construction and adornment of buildings, exterior and interior. In our northern latitudes care should be taken that ceramics are not used in places and in ways where the accumulation of snow and ice render the joints subject to alternate freezing and thawing, for in such case, unless the joints are protected with metal, the units will work loose in time. On vertical surfaces such protection is not necessary; the use of ceramics should therefore be confined for the most part to such surfaces: for friezes, panels, door and window architraves, and the like. When it is desirable for æsthetic reasons to tie a series of windows together vertically by means of some "fill" of a material different from that of the body of the wall, ceramics lend themselves admirably to the purpose—better than wood, which rots; than iron, which rusts; than bronze, which turns black; and than marble, which soon loses its color and texture in exposed situations of this sort.
On the interior of buildings, the most universal use of ceramics is, of course, for floors, and with the non-slip devices of various sorts which have come into the market, they are no less good for stairs. There is nothing better for wainscoting, and in fact for any surface whatsoever subject to soil and wear. These materials combine permanent protection and permanent decoration. But fired by the zeal of the convert the use of ceramics may be overdone. One easily recalls entire rooms of this material, floors, walls, ceilings, which are less successful than as though a variety of materials had been employed. It is just such variety—each material treated in a characteristic, and therefore different way—that gives charm to so many foreign churches and cathedrals: walls of stone, floors of marble, choir-stalls of carved wood, and rood-screen of metal: it is the difference between an orchestra of various instruments and a mandolin orchestra or a saxaphone sextette. Ceramics should never invade the domain of the plasterer, the mural painter, the cabinet maker. Do not let us, in our zeal for ceramics, be like Bottom the weaver, eager to play every part.
Ceramics have, as regards architecture, a distinct and honorable function. This function should be recognized, taken advantage of, but never overpassed. They offer opportunities large but not limitless. They constitute one instrument of the orchestra of which the architect is the conductor, an instrument beautiful in the hands of a master, and doubly beautiful in concert and contrast with those other materials whose harmonious ensemble makes that music in three dimensions: architectural art.
SYMBOLS AND SACRAMENTS
Architecture is the concrete presentment in space of the soul of a people. If that soul be petty and sordid—"stirred like a child by little things"—no great architecture is possible because great architecture can image only greatness. Before any worthy architecture can arise in the modern world the soul must be aroused. The cannons of Europe are bringing about this awakening. The world—the world of thought and emotion from whence flow acts and events—is no longer decrepit, but like Swedenborg's angels it is advancing toward the springtide of its youth: down the ringing grooves of change "we sweep into the younger day."
After the war we are likely to witness an art evolution which will not be restricted to statues and pictures and insincere essays in dry-as-dust architectural styles, but one which will permeate the whole social fabric, and make it palpitate with the rhythm of a younger, a more abundant life. Beauty and mystery will again make their dwelling among men; the Voiceless will speak in music, and the Formless will spin rhythmic patterns on the loom of space. We shall seek and find a new language of symbols to express the joy of the soul, freed from the thrall of an iron age of materialism, and fronting the unimaginable splendors of the spiritual life.