What self-propelled machine did Leonardo da Vinci sketch for a theatrical performance?

Leonardo da Vinci sketched a self-propelled cart for a theatrical performance.

The machine, designed around 1500, is often described as an early programmable vehicle. Springs supplied stored energy, and a system of gears and cams controlled the movement of the wheels. The cart could follow a predetermined route rather than being steered continuously by a driver. That made it useful for court spectacles, where an object could enter a stage or ceremonial space apparently under its own power.

The cart was not powered by an engine in the modern sense. Its motion came from wound springs, and its path was set mechanically. This distinction matters because popular accounts sometimes label it the first automobile, even though it carried no passengers and was designed for a limited performance purpose.

A reconstruction built in the twentieth century demonstrated that the surviving plan could produce movement. The design is also important because it links Leonardo’s mechanical studies with Renaissance theater, where automated scenery and moving figures were used to create wonder.