Readymade (noun)
An ordinary manufactured object that an artist selects and modifies so that it becomes art.
When Marcel Duchamp created the first readymade, he inaugurated conceptual art in which the idea takes precedence over aesthetics.
Marcel Duchamp, Bicycle Wheel, 1951 (after a lost original from 1913), metal wheel mounted on a painted wood stool, 51” x 25” x 16½”, Museum of Modern Art, New York, photo by rocor - flickr