What pyramid-shaped flight device did Leonardo da Vinci sketch as an early parachute?

Leonardo da Vinci sketched a pyramidal parachute as an early design for controlled descent.

Around 1485, Leonardo recorded the concept in the Codex Atlanticus. His drawing shows a large pyramid-shaped canopy supported by a wooden frame, with a person suspended below it. He proposed that a structure about 12 braccia wide and 12 high could allow a person to jump safely from a great height.

The design was based on the idea that air resistance beneath a broad canopy could slow a fall. Leonardo did not build or test the parachute, so it remained a theoretical invention for centuries. Modern parachutes use flexible fabric canopies and suspension lines rather than a rigid pyramid frame.

The design is often called the first parachute concept, but it was not a modern parachute in construction or operation. In 2000, Adrian Nichols built and tested a replica, adding safety measures and releasing it from a balloon rather than using it for an ordinary jump.