He then fled to West Germany, where he collaborated with fellow artist Sigmar Polke.
NEWYORKER: All Stripes
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Can a London dealer sell a Sigmar Polke at the Basel art fair without paying the royalty?
FORBES: Magazine Article
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There will also be exhibitions across the Tate dedicated to the work of abstract artist Kazimir Malevich, Germany's Sigmar Polke and a survey of British Folk Art.