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
Fountain (Duchamp) positioning ascribed to the object." He goes on to explain the importance of naming the object (ascribing a title). At least three factors came into play: the choice of object, the title, and how it was modified, if at all, from its 'normal' position or location. By virtue of placing a urinal on a pedestal in an art exhibition, the illusion of an artwork was created. Duchamp drew an ink copy of the 1917 Stieglitz photograph in 1964 for the cover of an exhibition catalogue, "Marcel Duchamp: Ready-mades, etc., 1913–1964". The illustration appeared as a photographic negative. Later, Duchamp made