What self-propelled cart did Leonardo da Vinci design for theatrical effects?

Leonardo da Vinci designed a self-propelled cart for theatrical effects.

The cart appears in Leonardo’s mechanical studies and is often described as an early programmable machine. Springs provided stored energy, while gears and control mechanisms regulated movement. The device could travel a limited distance without being pushed by a person, making it useful for stage displays or court entertainments.

Unlike a modern automobile, the cart had no combustion engine, steering wheel, or practical road system. Its movement came from wound springs and mechanical timing. Some reconstructions have demonstrated that the concept can work, although the exact original arrangement is debated because Leonardo’s surviving drawings do not provide every construction detail.

The cart is distinct from Leonardo’s later or related studies of vehicles and military machines. It is best understood as an automaton: a self-moving device designed to create controlled motion and visual surprise.