Alexander Calder (1898-1976) Aspen standing mobile--painted sheet metal, rod and lead weights 37½ x 23 x 28 in. (95.3 x 58.4 x 71.1 cm.) Executed in 1948. Literature M. Prather, Alexander Calder: 1898-1976, exh. cat., Washington, D.C., 1998, p. 230 (illustrated). Modern Definition of Space: Calder's Sculpture, exh. cat., New York, 2003, p. 82 (illustrated).