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I have been struggling for the right metaphor to explain the significance of MoMA’s new retrospective on the artistic career of Marcel Duchamp. As almost everyone knows, Duchamp is the guy who took a urinal, turned it on its side, signed it, and called it art. With that work and others—including dozens of other readymades—he inverted art from its focus on skill, technique, and visual impact to an emphasis on ideas and even acts. Before Duchamp, works of art were made by artists. Afterward, art was whatever an artist made.