Da Vinci’s interests ranged far beyond fine art. He studied nature, mechanics, anatomy, physics, architecture, weaponry and more, often creating accurate, workable designs for machines like the bicycle, helicopter, submarine and military tank that would not come to fruition for centuries. He was, wrote Sigmund Freud, “like a man who awoke too early in the darkness, while the others were all still asleep.”

Several themes could be said to unite da Vinci’s eclectic interests. Most notably, he believed that sight was mankind’s most important sense and that “saper vedere”(“knowing how to see”) was crucial to living all aspects of life fully. He saw science and art as complementary rather than distinct disciplines, and thought that ideas formulated in one realm could—and should—inform the other.

Probably because of his abundance of diverse interests, da Vinci failed to complete a significant number of his paintings and projects. He spent a great deal of time immersing himself in nature, testing scientific laws, dissecting bodies (human and animal) and thinking and writing about his observations. At some point in the early 1490s, da Vinci began filling notebooks related to four broad themes—painting, architecture, mechanics and human anatomy—creating thousands of pages of neatly drawn illustrations and densely penned commentary, some of which (thanks to left-handed “mirror script”) was indecipherable to others.

The notebooks—often referred to as da Vinci’s manuscripts and “codices”—are housed today in museum collections after having been scattered after his death. 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. Other notebooks contained da Vinci’s anatomical studies of the human skeleton, muscles, brain, and digestive and reproductive systems, which brought new understanding of the human body to a wider audience. However, because they weren’t published in the 1500s, da Vinci’s notebooks had little influence on scientific advancement in the Renaissance period.

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