The inventor Leonardo Da Vinci sketched a parachute in his "Codex Atlanticus" (fol. 381v), in about 1485. Leonardo's canopy was held open by a square wooden frame. The feasibility of Leonardo's pyramidal design was successfully tested in 2000 by the Briton Adrian Nicholas and again in 2008 by another skydiver. According to the historian of technology Lynn White, these conical and pyramidal designs, much more elaborate than early artistic jumps with rigid parasols in Asia, mark "the origin of the parachute as we know it".