There is no blaze or glare. Light floods the Exposition, but from concealed sources. All-pervasive, seemingly without source, the illumination is rather a quality of the Exposition atmosphere than an effect of lights. Nor is it a white light. It is softened and tinged with the warmest and mellowest of colors. So mellow, indeed, is the illumination that it would not even be brilliant but for the radiance of thousands of prisms hung about the great Tower of Jewels, the intense light of which swathes the lofty structure in a pure glow, at once bright and ethereal. (p. 135.) Above the glow in which the palaces are bathed, a pageant of light and color marches across the sky, a splendid aurora borealis, its bannered troops now wheeling in ordered array, now breaking their formation in wild riot, until out of the fantastic show huge beams of light separate to pierce the heavens. This unique system of illumination, devised by W. D'A. Ryan expressly for the Panama-Pacific Exposition depends upon floods of light from concealed sources. Around the walls of the palaces stand tall Venetian masts, topped with shields or banners. Concealed behind the heraldic emblems are powerful magnesite arc lamps. These spread their intense glow on the walls, but are hardly recognized as sources of light by the passer-by on the avenues. Batteries of searchlights and projectors mounted on the tops of buildings light the towers, the domes, and the statuary. Even the banners on the walls are held in the spotlights of small projectors constantly trained on them. That there may be no shadows, concealed incandescent bulbs light up every corner and angle of the towers, the arches, and the cloisters. The ghostly radiance of the Tower of Jewels comes from huge searchlights aimed at it from a circle of hidden stations. The many-colored fan of enormous rays, the Scintillator, which stands against the sky behind the Exposition, is produced by a searchlight battery of thirty-six great projectors mounted on the breakwater of the Yacht Harbor. It is manned nightly by a company of marines, who manipulate the fan in precise drills. Concealed lights shine through the waters of the fountains. In the Court of the Universe they are white, the colorless brilliance of the stars; in the Court of Seasons they are green, the color of nature; in the Court of the Ages they are red, with clouds of rosy steam rising around them. Writhing serpents spout leaping gas flames on the altars set around the pool of the Ages, and from other altars set by the entrances of the Court rise clouds of steam given the semblance of flame by concealed red lights. By the high altar on the Tower of Ages the same device is used to make the lights flame like huge torches.