Where is The Vitruvian Man , the drawing created by Leonardo da Vinci kept ?
He also proposes Leonardo da Vinci 's " self portrait " , Michelangelo 's " David " ( 1501–1504 ) , Albrecht Dürer 's " Melencolia I " and the classic violin design by the masters of Cremona ( Guarneri , Stradivari and several members of the Amati family ) as having similar regulator lines related to the golden ratio .