Alexander Calder was an American artist best known for his invention of the kinetic sculptures known as mobiles. Calder also produced a variety of two-dimensional artworks including lithographs, paintings, and tapestries as seen in his Butterfly (1970). “My whole theory about art is the disparity that exists between form, masses, and movement,” the artist once said. Born on August 22, 1898 in Lawnton, PA, Calder turned to art in the 1920s, studying drawing and painting under George Luks and Boardman Robinson at the Art Students League in New York. Calder moved to Paris to continue his studies in 1926, where he was introduced to the European avant-garde through performances of his Cirque Calder (1926–1931). “I was very...