Alexander Calder : Born in 1898 in Lawnton near Philadelphia, Alexander Calder is an american sculptor and painter. His is mainly known for his "mobiles" and "stabiles". Passionate of circus, The Calder Great circus of 1927 is one of his first great creations (exhibition : Alexandre Calder, les années parisiennes (the parisian years), 1926-1933, Centre Pompidou, Paris, 2009). His mobiles (named after Marcel Duchamp's proposition) are exposed for the first time at the Vignon gallery in 1932. This same year, the artist joined the Abstraction-Creation group. In 1943, The Museum of Modern Art organized a first retrospective, followed in 1946 by an exhibition in Paris prefaced by Jean-Paul Sartre, and in 1952, he obtained The great Prize of the Venice Biennale. The artist died in New York in 1976.