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In 1988, Knoebel created the work Kinderstern, a Social Sculpture realizing the extended notion of art, formulated 1967 by Joseph Beuys, his Professor at the Kunstakademie Düsseldorf, by which art also ought to change society. Since 1988, Kinderstern (Children Star) stands for the Children's rights and is the only artwork worldwide where proceeds go 100% to children in need.