Artists and critics regularly enlist theory in the creation and assessment of artworks, but few have scrutinized the art theories themselves. Here, Daniel examines and critiques the norms, assumptions, historical conditions, and institutions that have framed the development and uses of art theory. Spurred by the theoretical claims of Arthur Danto, a leader in the philosophy of the avant-garde, Herwitz reexamines the art and theory of major figures in the avant-garde movement including John Cage, Jean-François Lyotard, Jean Baudrillard, and Andy Warhol.