All of the sculpture about the Palace of Machinery partakes appropriately of the size and strength of that huge building which houses the world's progress in mechanical arts. The sculpture, like the building, is Roman rather than Greek in type and modern American in vigor and expression, as are the chief contents of the Palace. The sculptor, Haig Patigian of San Francisco, has expressed this combination with power and virility. The frieze here illustrated appears at the base of massive columns, interestingly made of simulated Sienna marble, the warm tones truly reproduced. The frieze is extremely energetic, although well restrained, and supports the great column as a basic frieze should do, especially when its subject is so appropriate to the purpose. Two winged Genii, one holding a pulley, one upholding the column upon his hands, alternate with two Disciples, for whom their extended wings create a background. One of these is complemented by hammer and anvil, the other by furnace and tongs. Both share the column's weight on powerful arms. The imaginary figures show potential strength in repose, the human figures potent strength in action. The frieze in low relief is colorful and decorative. The Powers Column Finials, Machinery Hall High upon the mighty columns that surround, relieve and give color to the immense facades of Machinery Palace, are Haig Patigian's masculine and trenchant figures "The Four Powers." These are of heroic height, and create an impression of superhuman size and strength even when raised so far above the ground. They have a simple robustness that accords well with their theme. Two of the Powers are abstract, the driving powers of thought; these are Invention and Imagination. Two are concrete, representing the mightiest powers of modern mechanics, Steam Power and Electric Power. Steam Power is forcing the driving arm of an engine; Electric Power, the world at his feet, handles the lightnings. He wears the winged cap of Mercury, messenger of the gods, for electricity is the messenger of modern days. Invention, crowned with the bays of achievement, holds in his hand a bird-man about to leave the earth; Imagination, accompanied by the eagle making ready to soar, dreams with closed eyes. Pirate Deck-Hand Niches, North Facade of Palaces