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July 1, 1976 – Permanent
Museum: Air and Space Museum
Location: Near Jefferson Drive and Independence Avenue entrances
• Ad Astra sculpture by Richard Lippold, is located near the museum's entrance at Jefferson Drive.
• Continuum—cast bronze sculpture (1976) by Charles O. Perry, is located at the museum's entrance at 6th and Independence Avenue.
• Delta Solar sculpture by Alejandro Otero is a large triangular grid piece, 48 feet wide and 27 feet high; it is filled with stainless steel rotary sails that turn in the slightest breeze. It is located on the west side of the museum near 7th Street; it was a gift from the Venezuelan government.