When did Alexander Calder make his first mobile?

Alexander Calder made his first unpowered mobiles in 1934.

They were pieces of tin suspended on thin wires or cords, and responding to the faintest air currents.

But before then, beginning in 1931, he had made constructions activated by hand or by motor power.

These became known as mobiles, while Calder’s non-moving constructions became known as stabiles.