“It might be that Lichtenstein only appears to conform to this old model of sculpture, in part to complicate it, even to refashion it for his own ends... Yet in Lichtenstein there is no stable, a priori ground—it is often, quite literally, a void, an empty space—and meaning accrues through the image alone. Thus his evocation of relief is not a reversion to the old pictorialism of postmodernist art at all; it is, rather, a turn to the new pictorialism of postmodernist culture, through which Lichtenstein suggests that today even sculpture might be reformatted as an image, indeed that anything might be—a glass, a bowl, a light… Here ‘media’ has trumped ‘medium.’”
Hal Foster, “Pop Pygmalion,” in Exh. Cat., London (and traveling), Gagosian Gallery, Roy Lichtenstein: Sculpture, 2005, pp. 11-13