T. J. Clark, George C. and Helen N. Pardee Chair and professor of history of art, University of California, Berkeley. Centered on a group of paintings by Picasso from the 1920s, a series of six lectures traces the artist's path to Guernica. In this audio podcast of the fourth lecture, originally delivered at the National Gallery of Art on April 19, 2009, the renowned art historian and professor T. J. Clark discusses Painter and Model, Picasso's largest canvas from 1927, and its corresponding sketchbook material, in which a monstrous conception of the body and sexuality accompanies a wholesale new vision of pictorial space.