Carl Andre - 5 x 20 Altstadt Rectangle, 1967. Hot-rolled steel, one hundred units, 3/16 x 19 11/16 x 19 11/16 inches (0.5 x 50 x 50 cm) each; 3/16 inches x 8 feet 2 1/2 inches x 32 feet 10 inches (0.5 cm x 250.2 cm x 10 meters 0.8 cm) overall. Solomon R. Guggenheim Museum, New York,Panza Collection

Carl Andre - 5 x 20 Altstadt Rectangle, 1967. Hot-rolled steel, one hundred units, 3/16 x 19 11/16 x 19 11/16 inches (0.5 x 50 x 50 cm) each; 3/16 inches x 8 feet 2 1/2 inches x 32 feet 10 inches (0.5 cm x 250.2 cm x 10 meters 0.8 cm) overall. Solomon R. Guggenheim Museum, New York,Panza Collection