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) attack was a work of performance art that Marcel Duchamp himself would have appreciated. In 1993 Pinoncelli urinated into the piece while it was on display in Nimes, in southern France. Both of Pinoncelli's performances derive from neo-Dadaists' and Viennese Actionists' intervention or manoeuvre. From the 1950s, Duchamp's influence on American artists had grown exponentially. Life magazine referred to him as "perhaps the world's most eminent Dadaist", Dada's "spiritual leader", "Dada's Daddy" in a lengthy article published 28 April 1952. By the mid-50s his readymades were present in permanent collections of American museums. In 1961, Duchamp wrote a letter to