Alexander Calder was an American modern artist born in 1898 in Pennsylvania to a family of artists. He is most famous for inventing the mobile, a kinetic art form consisting of abstract shapes suspended from wires that move with air currents. After studying engineering, Calder began attending art school in New York in 1923 and created miniature circuses that fascinated him, leading to his interest in kinetic art and mobiles. He lived in Connecticut for most of his life, creating colorful abstract mobiles and sculptures until his death in 1976.