Alexander Calder began his career as an engineer before discovering his passion for art and sculpture. He was heavily influenced by abstract art and began creating moveable sculptures and props for his miniature circus. In 1931, he started making his first suspended moving sculptures called "mobiles" which were originally powered by motors but later moved by wind. Calder constructed mobiles by cutting abstract shapes from sheet metal and wire, carefully arranging and balancing the pieces as he added new branches.