In a 1966 interview, Marcel Duchamp remarked on the propensity of twentieth-century artists to pair up. He gave the examples of Picasso and Braque, Delaunay and Léger, and himself and Picabia—“although,” he added, “Picabia-Duchamp is a strange match. A sort of artistic pederasty. Between two people one arrives at a very stimulating exchange of ideas.” […]