Donald Kuspit argues here that art is over because it has lost its aesthetic import. Art has been replaced by "postart," a term invented by Alan Kaprow, as a new visual category that elevates the banal over the enigmatic, the scatological over the sacred, cleverness over creativity. Tracing the demise of aesthetic experience to the works and theory of Marcel Duchamp and Barnett Newman, Kuspit argues that devaluation is inseparable from the entropic...