A quote from Robert Hughes from Things I Didn’t Know: A Memoir (New York: Alfred A Knopf, 2006), p. 326.
I did a program with Marcel Duchamp, to go with his retrospective at the Tate. In the course of this I asked Duchamp if he would mind signing my catalog. Obligingly, the old gentleman did so. “So is this a readymade now?” I asked. (A “readymade” was a class of object, more or less invented by Duchamp, which is chosen by an artist for its esthetic or other interest and designated, by that artist, to be a work of art. Examples: the famous porcelain urinal exhibited by Duchamp in New York as Fountain, or the spiky bottle-drying rack.) “Oh no, Monsieur Hughes,” he retorted gently. “You chose it.”