Hal Foster, Townsend Martin, Class of 1917, Professor of Art and Archaeology, Princeton University. In the six-part lecture series Positive Barbarism: Brutal Aesthetics in the Postwar Period, Hal Foster explores the pervasive turn, from the mid-1940s to the early 1960s, to the brut and the brutalist, the animal and the creaturely, as these are manifest in the early work of five artists. In the sixth and final lecture, “Claes Oldenburg and His Ray Guns,” held May 13, 2018, Foster examines how Oldenburg staked his hope for metamorphosis in the transformation of urban scrap.