Readymades of Marcel Duchamp to turn up any identical matches to photographs of the originals. However, there are accounts of Walter Arensberg and Joseph Stella being with Duchamp when he purchased the original "Fountain" at J. L. Mott Iron Works. Such investigations are hampered by the fact that few of the original "readymades" survive, having been lost or destroyed. Those that still exist are predominantly reproductions authorized or designed by Duchamp in the final two decades of his life. Shearer also asserts that the artwork "L.H.O.O.Q." which is recorded to be a poster-copy of the "Mona Lisa" with a moustache drawn on it, is
Marcel Duchamp Duchamp's "Étant donnés" tableau, "The Large Glass" was thought to have been his last major work. Duchamp's interest in kinetic works can be discerned as early as the notes for "The Large Glass" and the "Bicycle Wheel" readymade, and despite losing interest in "retinal art," he retained interest in visual phenomena. In 1920, with help from Man Ray, Duchamp built a motorized sculpture, "Rotative plaques verre, optique de précision" ("Rotary Glass Plates, Precision Optics"). The piece, which he did not consider to be art, involved a motor to spin pieces of rectangular glass on which were painted segments of a