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FRANKFURT AM MAIN, GERMANY - FEBRUARY 09: A visitor looks to " This is not a pipe" at the exhibition 'Rene Magritte - The Treachery of Images' (German: Der Verrat der Bilder') at Schirn Kunsthalle on February 9, 2017 in Frankfurt am Main, Germany. (Photo by Hannelore Foerster/Getty Images)