ITALY - MAY 04:  Drawing from the notebooks kept by Leonardo da Vinci (1452-1519) illustrating his many speculative and far-sighted designs. Da Vinci is considered the most outstanding Italian painter, sculptor, architect and engineer of the Renaissance period. His knowledge and understanding of mechanics, hydrodynamics, aeronautics, biology, anatomy and physiology, extended far beyond his times and his notebooks, written in mirror writing, contain original remarks on all of these subjects.  (Photo by SSPL/Getty Images)