What wheeled machine did Leonardo da Vinci sketch for producing theatrical effects?

Leonardo da Vinci sketched a self-propelled cart that could move without being pushed by people or animals.

The machine was drawn around 1478 to 1480 and is often described as an early ancestor of the automobile. Its movement came from coiled springs hidden inside the cart. Gears transferred the springs’ stored energy to the wheels, while a steering mechanism helped determine the direction of travel.

Historians generally connect the cart with theatrical performances or court spectacles rather than practical transportation. It may have been intended to move automatically across a stage and surprise an audience. Leonardo’s drawing does not provide every construction detail, so modern reconstructions rely on interpretation.

The cart is sometimes called a robot car, but it was not powered by an engine or fuel. Its spring mechanism made it a clockwork vehicle. A 2006 reconstruction at the Institute and Museum of the History of Science in Florence demonstrated that the concept could operate when built from the drawing.