In the long avenue that runs east and west through the center of the group, the unity of the eight buildings becomes more apparent as we view the noble arches which join them, and note the character of their inner facades. Education and Food Products are alike in the walls and portals fronting on the dividing aisle. The Spanish architecture of the south facade of Education is here carried over to Food Products. Similarly, the avenue between Mines and Varied Industries is the same on both sides, carrying out the Old Italian of the east front, and with The Miner repeated in the portal niches of both palaces. The avenues leading from the Court of the Universe to the Court of Ages and the Court of Seasons have been variously called the Aisles of the Rising and the Setting Sun, or the Venetian and Florentine Aisles. Their four walls are in the style of the Italian Renaissance, and show a diaper design similar to that on the Italian towers of the Courts of Flowers and Palms.
In an artistic sense, this group is incomplete without the Palace of Fine Arts on the west and Machinery Hall on the east. (p. 105, 106.) Balancing each other in the general scheme, they form the necessary terminals of the axis of the Exposition plan. This matter of balance has been carefully thought out everywhere, and affords a fine example of the co-operation of the many architects who worked out the vast general design. The Courts of Seasons and Ages are set off against each other; the Courts of Palms and Flowers weigh equally one against the other; the Arches of the Nations not only balance but match; even the Tower of Jewels, which is the center of the whole plan, is offset by the Column of Progress. In the South Gardens, the Palace of Horticulture is balanced against Festival Hall.
Color and Material.—All other Expositions have been almost colorless. This is the first to make use of the natural colors of sea and sky, of hill and tree, and to lay upon all its grounds and buildings tints that harmonize with these. Jules Guerin, the master colorist, was the artist who used the Exposition as a canvas on which to spread glorious hues. Guerin decided, first, that the basic material of the buildings should be an imitation of the travertine of ancient Roman palaces. On this delicate old ivory background he laid a simple series of warm, yet quiet, Oriental hues, which, in their adaptation to the material of construction and to the architecture, as well as in their exquisite harmony with the natural setting, breeds a vast respect for his art.
The color scheme covers everything, from the domes of the buildings down to the sand in the driveways and the uniforms of the Exposition guards. The walls, the flags and pennants that wave over the buildings, the shields and other emblems of heraldry that hide the sources of light, draw their hues from Guerin's plan. The flowers of the garden conform to it, the statuary is tinted in accordance with it, and even the painters whose mural pictures adorn the courts and arches and the Fine Arts Rotunda were obliged to use his color series. The result gives such life and beauty and individuality to this Exposition as no other ever had. It makes possible such beautiful ornamentation as the splendid Nubian columns of the Palace of Fine Arts, and the glories of the arches of the Court of the Universe. (See frontispiece.)
Go into that Court on a bright day and take note of the art that has made Nature herself a part of the color plan. From a central position in the court, where one can look down the broad approach leading from the bay, Nature spreads before the beholder two expanses of color, the deep blue of salt water sparkling in the sun, and the not less deep, but more ethereal, blue of the California sky. With this are the browns and greens of the hills beyond the bay, and, nearer at hand, the vivid verdure of lawns and trees and shrubs. All these the designer used as though they were colors from his own palette. To go with them in his scheme he chose for pillar and portico, for the wall spaces behind, for arch and dome, for the decorations and for material of the sculptures, such hues that the whole splendid court and its vistas of palaces beyond blend with the colors of sea and sky and of green living things in a glorious harmony.
Such a view of the heart of the Exposition at its best compels recognition of Guerin's skill in color. It needed a vivid imagination to realize the possibilities of the scene, and visualize it. It required infinite delicacy and a fine sense of the absolute rightness of shade and tint to produce such harmonious beauty. The mere thought of it is a lesson in art.
The decision of the architects to develop the theme of an Oriental walled city, and the natural setting of the site, Mediterranean in its sea and sky, led Guerin to select Oriental colors. Aiming at simplicity, he decreed that not more than eight or nine colors should be found upon the subdued palette from which he would paint the Exposition. Then he took into consideration the climate and atmospheric conditions peculiar to San Francisco. Every phase of sky and sea and land, every shadow upon the Marin hills, across the bay, was noted in choosing an imitation of natural travertine for the key color of the Palaces.
This is a pale pinkish-gray-buff, which may be called old ivory. It is not garish, as a dead white would be, especially in the strong California sunlight, but soft and restful to the eye. It harmonizes with the other colors selected, and, most important of all, it avoids a certain "new" effect which pure white would give, and which is deadly to art.
Paul Deniville, who had already developed a successful imitation of travertine, was engaged to make the composition to be applied over the exterior walls. This is a reproduction in stucco of the travertine marble of the Roman palaces of the period of Augustus. This marble is a calcareous formation deposited from the waters of hot springs, usually in volcanic regions, and is common in the hills about Rome. It often contains the moulds left by leaves and other materials incorporated in the deposit. These account for the corrugations of the stone when it is cut. In California, as in other regions where hot springs are found, travertine is not uncommon. It is found notably in the volcanic district of Mono County, and elsewhere, sometimes in the form of Mexican onyx, which is only a translucent variety of the same marble. In its reproduction here the marble has been imitated even to the natural imperfections which roughened the Italian stone. In the concave surfaces of the ornamentation the color has been deepened, so that it appears sometimes as a rich reddish brown. All this enhances the antique effect, making the palace walls and columns still more like those of the old Roman construction.
Besides the travertine the eight other colors employed are: