Which Leonardo da Vinci design is a pyramid-shaped parachute intended to slow a person's fall?

Leonardo da Vinci designed a pyramidal parachute to slow a person's fall.

Leonardo sketched the design in the Codex Atlanticus around 1485. It consisted of a rigid wooden frame covered with linen, forming a pyramid about 7.2 metres high and 7.2 metres wide at its base. His notes proposed that a person could descend safely from a great height with this structure.

The design was not a practical modern parachute: it had no harness, suspension lines, or compact fabric canopy. Its size and weight also made it very different from equipment used today. In 2000, British skydiver Adrian Nicholas built and tested a version based on Leonardo's measurements. It descended successfully, although Nicholas used a modern parachute for the final part of the landing because the replica was difficult to steer.

The pyramid shape is the key identifying feature. Leonardo's concept belongs to the history of parachute ideas, but it was created centuries before practical parachuting equipment became available.