An illustrated examination of a work--a Warhol that isn't by Warhol--that embodies a shift in attitudes about artistic authorship and originality. Warhol Marilyn (1965) is not a work by Andy Warhol but by the artist Elaine Sturtevant (1930-2014). Throughout her career, Sturtevant (as she preferred to be called) remade and exhibited works by other contemporary artists, among them Jasper Johns, Roy Lichtenstein, and Robert Rauschenberg...