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Painter Sigmar Polke explains the surface structure of one of his works in the museum for contemporary art in Siegen, Germany, 21 June 2007. Polke receives the 11th Ruben award of the city Siegen, endowed with 5200 euros. A Polke exhibition opens on 24 June, running until 16th September in Siegen. Photo: Fredrik von Erichsen (KEYSTONE/DPA/Fredrik von Erichsen)