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"I'm nothing else but an artist, I'm sure," he said in '61 in a filmed interview for the BBC, "and delighted to be.... The years change your attitude, and I couldn't be very iconoclastic any more." I haven't seen the film, but reading this in print it strikes me that he couldn't have been serious in saying this, however much things had changed. He changed his anti-art rhetoric somewhat, but more, it seems, to suit the times than to express a major change in himself. At a symposium at MOMA (an event that was part of William Seitz's huge "Art of Assemblage" exhibition), he was asked, "Did you, or do you, really want to destroy art?" Duchamp's answer was: "I don't want to destroy art for anybody else but myself, that's all."
Among the sources: Calvin Tompkins, Duchamp, 1996.