Marcel Duchamp,

1
Marcel Duchamp, Bicycle Wheel, 1913 MOMA, New
York Readymade
2
Marcel Duchamp, The Fountain, 1913 Photograph by
Alfred Stieglitz
3
Raoul Hausmann, Mechanical Head, 1919-1920,
Collection of the artist, Berlin,
Germany
4
Marcel Duchamp, Bottle Rack, 1914, galvanized
iron, Musee National dArt Moderne, Centre
Pompidou, Paris, France