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A Century of Progress %u2022 Vintage PostcardsExhibitor & Concessionaire PostcardsGeneral Motors ExhibitGeneral Motors BuildingFrom every part of the world, millions of visitors are coming to A Century of Progress, Chicago. One of the sights is the General Motors Building. This exhibit alone is worth a trip to the Fair. Plan to spend at least one day under the Tower by the Lake.The Two Billion Candle Power ScintillatorThe most outstanding effect in night illumination is produced by the scintillator, consisting of a battery of twenty-four arc searchlights having a total light output of 1,920,000,000 candlepower. Mounted on swivel and trunnion bases, these 36-inch projectors may be turned at any angle, to shoot variegated patterns of colored light into the sky. The scintillator is located on the shore of lake Michigan just south of the Travel and Transport Building, and nightly paints the sky in brilliant orange, blue, purple, green, and rainbow hues, great pencils of colored light ever flashing in changing patterns.