Today's lecture featured works by 20th century artists working in painting, sculpture, and conceptual art including Francis Bacon, Lucien Freud, Philip Pearlstein, Richard Estes, Chuck Close, Gerhard Richter, Bridget Riley, Robert Indiana, Robert Mangold, Agnes Martin, Ellsworth Kelly, Frank Stella, Jules Olitski, Robert Ryman, Brice Marden, Blinky Palermo, On Kawara, Daniel Buren, John Baldessari, Donald Judd, Dan Flavin, John McCracken focusing on figurative works, abstraction, pop art, minimalism and conceptual approaches.