Leonardo da Vinci filled 7,000 pages of notebooks with designs for flying machines, detailed anatomical studies, river diversion plans, architectural proposals, and philosophical observations. He finished fewer than 20 paintings in his entire career. He kept the Mona Lisa with him for the last 16 years of his life, touching it up and never delivering it to the patron who had commissioned it.
Da Vinci is typically described as the ultimate Renaissance man — a polymath who could do anything. The biographical reality is stranger and more instructive: he was a man who could begin almost anything, and complete almost nothing. The question of why requires looking at the specific choices he made across a 67-year life.
The Letter That Got Him to Milan: Selling Himself as a Military Engineer
Around 1482, Leonardo wrote a letter to Ludovico Sforza, the Duke of Milan, seeking employment. The letter is remarkable for what it emphasizes: not painting, not sculpture, not the artistic reputation he had been building in Florence, but military engineering. He offered detailed descriptions of portable bridges, armored vehicles, mortars, and methods for draining the moats of besieged cities.
At the end — almost as an afterthought — he mentioned that he could also do painting and sculpture. Ludovico hired him. Leonardo spent 17 years in Milan, during which he painted The Last Supper and filled hundreds of pages of notebooks with engineering and scientific observations. The military projects were mostly never built. The Last Supper began deteriorating almost immediately because Leonardo had experimented with a technique unsuited to the wet Milanese walls.
The Mona Lisa: Why He Never Delivered It
The Mona Lisa was commissioned in 1503, most likely by the Florentine silk merchant Francesco del Giocondo as a portrait of his wife Lisa. Leonardo began it, worked on it intermittently for years, and never delivered it. He took it with him when he moved to Rome in 1513, then to France in 1516 when King Francis I invited him to the Château du Clos Lucé.
He was still working on it when he died in 1519. Francis I is said to have been at his bedside. After Leonardo’s death, Francis purchased the painting from his estate. It eventually entered the French royal collection, was hung in the Louvre by Napoleon, and is now the most visited painting in the world. Francesco del Giocondo, the man who commissioned it, almost certainly never received it and may never have seen the finished version.
The Anatomy Studies: Science That Disappeared for 200 Years
Leonardo performed or observed dozens of human dissections and produced anatomical drawings of extraordinary accuracy and beauty — images of the heart, the fetus in the womb, the muscles of the arm, the structure of the eye — that were centuries ahead of contemporary medical knowledge. He intended to publish a comprehensive anatomy treatise.
He never did. The notebooks passed to his assistant Francesco Melzi after his death, then eventually to Melzi’s heirs, who had no idea what they contained. For nearly 200 years, they sat in a villa in Vaprio d’Adda. When they were finally examined and some published in the 19th century, anatomists found that Leonardo had described the hardening of the arteries — a form of arteriosclerosis — and correctly deduced it as a cause of death in old age. This observation was unknown to European medicine until the 19th century. He had made it around 1510.
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The Da Vinci simulator covers 8 decisions: whether to specialize or wander, the letter to Ludovico Sforza, leaving the Adoration of the Magi unfinished, building the flying machine, keeping the Mona Lisa, the anatomy notebooks, working for Cesare Borgia, and the final question Leonardo asked about his life’s work. You commit before the historical reveal.
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