Behind its curved, shiny black granite façade, the K20 on Grabbeplatz houses 20th century art. The permanent collection of the museum includes works by Picasso, Matisse, Mondrian and Klee. Representatives of American post-war art are included such as Jackson Pollock, Robert Rauschenberg, Jasper Johns and Andy Warhol. And of course, Joseph Beuys, Gerhard Richter, Tony Cragg, Katharina Fritsch and Imi Knoebel are not missing in Düsseldorf.