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,
Marcel Duchamp circle. When the apparatus spins, an optical illusion occurs, where the segments appear to be closed concentric circles. Man Ray set up equipment to photograph the initial experiment, but when they turned the machine for the second time, a belt broke, and caught a piece of the glass, which after glancing off Man Ray's head, shattered into bits. After moving back to Paris in 1923, at André Breton's urging, with financing by Jacques Doucet, Duchamp built another optical device based on the first one, "Rotative Demisphère, optique de précision" (Rotary Demisphere, Precision Optics). This time the optical element was a