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 his studio, and died of heart failure. Duchamp was an atheist. He is buried in the Rouen Cemetery, in Rouen, France, with the epitaph, "D'ailleurs, c'est toujours les autres qui meurent" ("Besides, it's always the others who die"). Many critics consider Duchamp to be one of the most important artists of the 20th century, and his output influenced the development of post–World War I Western art. He advised modern art collectors, such as Peggy Guggenheim and other prominent figures, thereby helping to shape the tastes of Western art during this period. He challenged conventional thought about artistic processes and rejected