Before Warhol, 'Before and After' would have been a piece of boilerplate commercial art, whose maker would be long forgotten. By 1961, greatly enlarged, it became a work of high art....Warhol did not simply replicate a grungy piece of commercial art. He made the distinction between a piece of grungy art and a piece of high art at once invisible and momentous. But that meant that he changed not so much the way we look at art but the way art was understood.
Andy Warhol, Arthur Danto
