In this collection, I recall some of his works and the way he left his marks on engineering, architecture, sculpture, geometry, anatomy and the recovery of the classical perspective. Despite drawing by hand, I rounded up rulers, squares and compasses to confirm the theory of the Golden Ratio in my illustration of the Mona Lisa. Here and there, I hide measurements taken from the Last Supper, or I highlight the bronze horse commissioned by the city of Milan, I make references to the hollow dodecahedron or represent the Vitruvian Man.