Structural pageantry and beauty are the architectural motifs of the spectacular Fair buildings that blend and vitalize America's prehistoric races... Aztec, Mayan, Incan... with Oriental lands of mystery... Cambodia, India, Cathay. A magic walled city of the pacific, the Fair will thrill the multitudes with mystic forms, giant pyramids, long pavilions of light and shadow, Towering skyward, the Exposition's Spire to the Sun translates mass into height, matches the breathless loom of the Bay…