The following is from Flash Art #23, (april 1971).

"in 1960 he signed (or claimed) money (rubles, dollars, francs, and marks) as art; he signed the deaths of Yves Klein and Piero Manzoni, also tombs catacombs, mummies and "MY DEATH"; he made holes or removals, stating that "the hole is by essence an extraordinary thing". In 1961: "destruction of my works of art as art"; in 1962, he made two identical works and dated on 1952, the other 1966. In 1967: "To ask somebody for ideas and then sign the ideas with someone else's name"; in 1968, "to decide what is bad in art and do it", etc. Ben's major influence was clearly that of Yves Klein, whose mystical approach to non-object art affected all European "concept art" as well as most Fluxus actions and gestures. In 1960, Klein signed "the world".