Alexander Calder was an American sculptor known for creating kinetic sculptures called mobiles that moved with air currents. He began making small mobiles for a miniature circus that toured as an exhibit. After this, Calder made larger mobiles and stabiles out of materials like metal sheets, wires, wood and plaster. His works featured bright colors, odd shapes and complex geometric designs without much symmetry to make them stand out. Calder created various types of mobiles like hanging, standing and wall mobiles, as well as stabiles, sculptures and monumental sculptures in bronze, steel and other materials.