American sculptor and artist Alexander Calder (1898-1976) in his studio in 1973. Trained as a mechanical engineer, he went to the Art Students' League in New York and then lived in Paris in the 1920s, where he became friends with avant-garde artists like Jean Arp and Marcel Duchamp. He invented the mobile and created abstract static sculptures that were dubbed stabiles. In the 1950s he moved into creating abstract monumental sculptures. Stock photo.

Marc Chagall working on a stained glass design at the Jacques Simon Glass Works in Reims, France. 1960s. Stock photo.

Salvador Dali (May 11, 1904 - January 23, 1989), Spanish Surrealist artist. Stock Photo.

Artist Helen Frankenthaler in her studio on east 83rd St, in NYC; undated. Stock Photo.

Painter David Hockney (born 9 July 1937) working in his home studio in Los Angeles, 1966. Hockney was a significant contributor to the British Pop art movement of the 1960's, and lives today in Los Angeles, California. Stock Photo.

Frida Kahlo (1907-1954), famous Mexican painter, painting her father's portrait. Mexico City, 1952. Stock Photo.

Roy Lichtenstein (1923-1997), American pop artist, with his art. Photographed by Bernard Gotfryd in 1969. Stock photo.

Joan Miro (1893 - 1983), Spanish Catalan painter and sculptor, in foreground, with ceramicist Josep Llorens Artigas (1892 - 1980) in Artigas' studio in Gallifa, Catalonia, Spain, circa 1954. Stock photo.

Georgia O'Keefe (November 15, 1887 - March 6, 1986), American artist, in the patio of her home in Abiquiu, New Mexico, in 1971. Stock photo.

Pablo Picasso (October 25, 1881 - April 8, 1973), Spanish artist, in 1962. Stock photo.

Jackson Pollock at work on a painting at his studio on Long Island, NY, 1950. Jackson Pollock (January 28, 1912 - August 11, 1956) was an American abstract expressionist painter most famous for his drip technique, or 'action painting'. Stock photo.

Keith Haring, American artist

Keith Haring (1958-1990), American artist working on an installation at the Palladium nightclub in New York City, USA. Haring died in 1990 as a result of AIDS-related complications. Photographed on May 1985. Stock photo.