Apolinère Enameled was painted circa 1916 by Marcel Duchamp , as a heavily-altered version of an advertisement for paint ("Sapolin Enamel"). The picture depicts a girl painting a bed-frame with white enamelled paint. The depiction of the frame deliberately includes conflicting perspective lines, to produce an impossible object. To emphasise the deliberate impossibility of the shape, a piece of the frame is missing. The piece is sometimes referred to as Duchamp's "impossible bed" painting.