Sigmar Polke at Editions Schellmann – artmarketblog.com German artist Sigmar Polke is undoubtedly one of the most important and influential artists of the post-war generation. Polke is often grouped with other important German artists such as Keifer, Penck, Richter and Immendorf all of whom were part of the Neo-Expressionist movement. The Neo-Expressionist movement developed in [...]