Alexander Calder, the pioneering American sculptor, is celebrated for revolutionising modern art with his invention of the mobile kinetic sculptures that moved with air currents to create ever changing forms. Active throughout much of the 20th century, Calder also produced monumental stabiles, vibrant abstract paintings, and works on paper, each defined by a sense of play, balance, and movement. His use of bold colours and organic shapes connected modernist abstraction with a joyful immediacy that continues to captivate audiences worldwide. Today, Calder is regarded as one of the most innovative and influential artists of his generation, with works represented in major museums and public spaces around the globe.