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Sam Keller, left, director of the Fondation Beyeler, and Richard Serra, right, during a press conference in Riehen, Switzerland, Friday, May 20, 2011. The Fondation Beyeler is devoting its large summer exhibition to the art of Constantin Brancusi (1876-1957) and Richard Serra, born 1939, two of the most important sculptors of the twentieth century. (KEYSTONE/Andreas Frossard)