Happy Birthday Alexander Calder!! The American sculptor was born in 1898. He began as an engineer and gravitated to art, credited for inventing the mobile. The kinetic sculptures are flat shapes that suspend and float through the air. “Each element able to move, to stir, to oscillate, to come and go in its relationships with the other elements in its universe.” He also created “stabiles” mobiles rooted to the ground on a base. His work has been described as playful unions of engineering and sculpture. Calder is known as the most influential sculptor of our time.