The museum's particularly strong collection of 20th-century German paintings includes the world's largest Max Beckmann collection, which includes Christ and the Woman Taken in Adultery.[18] In recent years, the museum has been actively acquiring post-war German art to complement its Beckmanns, such as works by Joseph Beuys, Gerhard Richter, Martin Kippenberger and others.[2] The collection also includes Chuck Close's Keith (1970).[19]