L.H.O.O.Q. a late interview (Schwarz 203), Duchamp gives a loose translation of "L.H.O.O.Q." as "there is fire down below". Francis Picabia, in an attempt to publish "L.H.O.O.Q." in his magazine 391 could not wait for the work to be sent from New York City, so with the permission of Duchamp, drew the moustache on Mona Lisa himself (forgetting the goatee). Picabia wrote underneath "Tableau Dada par Marcel Duchamp". Duchamp noticed the missing goatee. Two decades later, Duchamp corrected the omission on Picabia's replica, found by Jean Arp at a bookstore. Duchamp drew the goatee in black ink with a fountain pen,
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