Alexander Calder was an American sculptor and artist born in 1898 in Philadelphia to a family of artists. He studied mechanical engineering and art, and created kinetic sculptures and mobiles that incorporated movement. In 1926 he moved to Paris where he created toys, circus performances, and wire portraits of his artist friends. He is known for inventing mobiles, sculptures that moved suspended from the ceiling, as well as stabiles, static sculptures made of metal. His mobiles and stabiles can be found in public spaces around the world.