<Tr> <Th> Movement </Th> <Td> Kinetic art, Surrealism, Abstraction (art) </Td> </Tr> <Tr> <Th> Awards </Th> <Td> Presidential Medal of Freedom </Td> </Tr> <P> Alexander Calder (/ ˈkɔːldər /) is widely considered to be one of the most important American sculptors of the 20th century . He is best known for his colorful, whimsical abstract public sculptures and his innovative mobiles, kinetic sculptures powered by motors or air currents, which embraced chance in their aesthetic . Born into a family of accomplished artists, Calder's work first gained attention in Paris in the 1930s and was soon championed by the Museum of Modern Art in New York, resulting in a retrospective exhibition in 1943 . Major retrospectives were also held at the Solomon R. Guggenheim Museum (1964) and the Museum of Contemporary Art, Chicago (1974). Calder's work is in many permanent collections, most notably in the Whitney Museum of American Art, but also the Guggenheim Museum; the Museum of Modern Art; the National Gallery of Art, Washington, D.C.; and the Centre Georges Pompidou . He produced many large public works, including . 125 (at JFK Airport, 1957), Pittsburgh (Carnegie International prize winner 1958, Pittsburgh International Airport) Spirale (UNESCO in Paris, 1958), Flamingo and Universe (both in Chicago, 1974), and Mountains and Clouds (Hart Senate Office Building, Washington, D.C., 1976). Although primarily known for his sculpture, Calder was a prodigious artist with a restless creative spirit, whose diverse practice included painting and printmaking, miniatures (such as his famous Cirque Calder), children's book illustrations, theater set design, jewelry design, tapestries and rugs, and political posters . Calder was honored by the US Postal Service with a set of five 32 - cent stamps in 1998, and received the Presidential Medal of Freedom, posthumously in 1977, after refusing to receive it from Gerald Ford one year earlier in protest of the Vietnam War . </P> <P> Alexander "Sandy" Calder was born in 1898 in Lawnton, Pennsylvania . His actual birthday, however, remains a source of much confusion . According to Calder's mother, Nanette (née Lederer), Calder was born on August 22, yet his birth certificate at Philadelphia City Hall, based on a hand - written ledger, stated July 22 . When Calder's family learned about the birth certificate, they reasserted with certainty that city officials had made a mistake . </P>

Name the artist who first created the mobile