Abstract Expressionism The designation Abstract Expressionism encompasses a wide variety of postwar American painting through which the U.S. first became the center of the avant-garde. [More] Shortcut Full search								<Previous work Next work> Jackson Pollock, Untitled (Green Silver), ca. 1949. Enamel and aluminum paint on paper mounted on canvas, 22 3/4 x 30 3/4 inches. Solomon R. Guggenheim Museum, Gift of Sylvia and Joseph Slifka, 2004. 2004.63. Jackson Pollock © 2007 The Pollock-Krasner Foundation/Artists Rights Society (ARS), New York.