![Duchamp, Rotative Demisphère (Optiques de précision)]()

Marcel Duchamp
French, 1887–1968
Rotative Demisphère (Optiques de précision) (Rotary Demisphere [Precision Optics]), 1924
motorized optical device: painted wood demisphere fitted on velvet disk, copper collar with Plexiglas dome, motor, pulley, and metal stand
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