When Marcel Duchamp invented the readymade one hundred years ago, there was no way of knowing that these random objects taken from everyday life would have such a lasting influence on art. The book The Readymade Century examines his readymades from two perspectives: the Readymade Index investigates the genesis and consistency of Duchamp’s concept in the first fifty years (1914 – 1964) of the “readymade century”. The second part, Readymade Exposition, describes the history of its reception, which extends far beyond the artist’s lifetime.