Marcel Duchamp (1887–1968) left a large volume of correspondence—some 1,000 documents—in which he talks of his plans and works, including the “ready-made”—a concept that was radically to change the course of 20th-century art. This book features a selection of 285 of Duchamp’s most telling and important letters transcribed and published for the first time in their original language, together with English translations, as well as a detailed introduction to each correspondent and comments on the historical content of each letter.