Alexander Calder was a mobile-creating artist who was born in 1898 and died in 1976. He is best known for his abstract sculptures, which he called 'mobiles, ' that moved with air currents. He was also a painter and printmaker. His works are often seen in public places, such as the National Gallery of Art in Washington, D.C. and the Guggenheim Museum in New York City. He is considered one of the most influential sculptors of the 20th century.