Half-circle, Quarter-circle, and Sphere

Alexander Calder, Half-circle, Quarter-circle, and Sphere, 1932. Painted metal and wood with motor, overall: 76 5/8 × 35 1/2 × 25 in. (194.6 × 90.2 × 63.5 cm). Whitney Museum of American Art, New York; purchase, with funds from the Howard and Jean Lipman Foundation, Inc. 69.258. © Calder Foundation, New York / Artists Rights Society (ARS), New York