Four readers requested a post on Marcel Duchamp, one of the most controversial and most discussed artists in recent history. A Google search yields almost 1.5 million results for the French and American artist, whose 121st birthday was yesterday. Much of the controversy and discussion revolves around Duchamp’s “readymades,” particularly “Fountain” (1917), but, as evidenced by the four works of art above, there is so much more to Marcel Duchamp than just a urinal.