On June 15, 1915, a sweltering day in Manhattan, Marcel Duchamp, then twenty-eight, arrived in New York on the SS Rochambeau. “I am not going to New York, I am leaving Paris,” he announced to his American artist-patron Walter Pach. Like a number of other European avant-gardists, Duchamp was escaping the Great War - a war in which both his artist brothers, Jacques Villon and Raymond Duchamp-Villon, were already serving and in which the latter was to be killed in 1918. Duchamp himself was exempt from military service because of a heart murmur, but the very idea of war struck him as insane: “I must say,” he later told an interviewer, “I admire the attitude of combating invasion with folded arms.”

But it was not only the war that brought Duchamp to America. Increasingly, he had come to dislike the Bohemian “artistic life” of Paris, where scores of artists worked in small suburban studios vying to emulate the great Cubist painters. America, as he told an interviewer in September 1915, was different: