More modern pieces showing styles of abstract expressionism, pop art, and art of the 1970s through the end of the century can also be found represented by artists such as Arshile Gorky, Jackson Pollock, Clyfford Still, and Andy Warhol. Additionally, the gallery is also rich in various pieces of post-war American and European art;[12] their contemporary collection includes pieces by artists such as Kiki Smith, Allan Graham, Georg Baselitz, John Connell, and Per Kirkeby. The museum bought Anselm Kiefer's large-scale Die Milchstrasse (The Milkyway) (1985–87) in 1988 to celebrate its 125th anniversary.[13]