Alexander Calder is credited with inventing what type of sculpture?

Alexander Calder is credited with inventing the mobile, a type of kinetic sculpture that moves or is designed to be in motion. His innovative designs often featured delicate, suspended shapes that were set in motion by air currents or manual interaction. Calder's mobiles are celebrated for their playful aesthetic and dynamic interplay of form and space. He also created static sculptures known as "stabiles," which are characterized by their solid and stable structures.