Marcel Duchamp was born in a small town in Normandy, France, but moved to Paris in 1904, to study art at the Académie Julian. Even in those early days, he had radical opinions and hosted regular discussions with the Cubist artists Juan Gris, Fernand Léger, and Alexander Archipenko. By the end of W.W. I, he’d already rejected work by contemporaries such as Henri Matisse, calling their art “retinal”—he meant it only pleased the eye. Duchamp thought art should be about the mind. Which led him to the question: What is art? Works from Duchamp’s influential career, from 1902 until his death in 1968, make up this comprehensive retrospective. —Elena Clavarino