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
Readymades of Marcel Duchamp it a little game between 'I' and 'me'". Duchamp was unable to define or explain his opinion of readymades: "The curious thing about the readymade is that I've never been able to arrive at a definition or explanation that fully satisfies me." Much later in life Duchamp said, "I'm not at all sure that the concept of the readymade isn't the most important single idea to come out of my work." Robert Fulford described Duchamp's ready-mades as expressing "an angry nihilism". By submitting some of them as art to art juries, the public, and his patrons, Duchamp challenged conventional notions