Probably because of his abundance of diverse interests, da Vinci failed to complete a significant number of his paintings and projects.
It is uncertain whether the painting is a portrait of the wife of the Florentine citizen Francesco del Giocondo as traditionally believed, while Mona Lisas enigmatic smile remains a subject of speculation.
The Codex Atlanticus, for instance, includes a plan for a 65-foot mechanical bat, essentially a flying machine based on the physiology of the bat and on the principles of aeronautics and physics.
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Most notably, he believed that sight was mankinds most important sense and that saper vedere(knowing how to see) was crucial to living all aspects of life fully.