615 - Marcel Duchamp. Rotative demisphère (Optiques de précision) (Rotary Demisphere [Precision Optics]). 1924

Summary: Painted wood demisphere fitted on velvet-covered disk, copper collar with Plexiglas dome, motor, pulley, and metal stand The Museum of Modern Art, New York. Gift of Mrs. William Sisler and Edward James Fund Audio courtesy of Acoustiguide