Ask Aillume - Get a Straight Answer I am Astrid Aillume, a detective from Denmark. In the traditional framing of art history, Leonardo da Vinci is often romanticized as a mystical, all-powerful genius driven purely by sudden bursts of inspiration. But if we look past the myth and examine the actual employment contracts, project budgets, and the thousands of pages of personal working notes he left behind, a completely different, real-world version emerges.
Through a detective’s lens, Da Vinci was essentially a highly advanced, cross-disciplinary research and development (R&D) engineer plagued by a severe case of perfectionist procrastination. Here is the true record of his career output and projects:
Work Portfolio: The True Output of a Master
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Total Lifetime Paintings Delivered: Only about 15 to 20 paintings. Over his 67 years of life, the number of oil paintings he completely finished and handed over to his clients can be counted on two hands.
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The Little-Known Micro-Technique (Micron-Level Layering):
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When painting the Mona Lisa, he used his signature "sfumato" (smoky) technique. Modern X-ray and spectroscopic scans reveal that the painting consists of up to 30 incredibly thin layers of oil paint glaze.
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Remarkably, the combined thickness of all these layers is less than 40 microns (which is less than half the thickness of a single human hair). He used this extreme level of micro-control to create the illusion of translucent, living skin.
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Unfinished and Abandoned Projects:
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The Battle of Anghiari (a massive mural): Because he experimented with a new kind of oil pigment and a drying method he invented himself, the paint literally liquefied and ran down the wall, destroying the project on the spot.
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The Sforza Horse (a colossal bronze statue): Designed to stand 7.3 meters tall, it required 70 tons of bronze. While the full-scale clay model was completed, war broke out, and all the bronze was requisitioned to make cannons, wiping his hard work down to zero.
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Preserved Notebooks and Manuscripts (A Massive, Underestimated Volume): Around 7,200 pages survive to this day.
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A Unique Writing Habit: All of his notes were written in his trademark mirror writing, using his left hand to write backward from right to left. Someone else would need a mirror just to read it.
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Design Sketches: His notes contain over 1,000 highly detailed drawings covering anatomy, mechanics, hydraulic engineering, and optical geometry.
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The Physical Toll of Anatomical Research:
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In an era long before refrigeration, he personally dissected more than 30 human corpses just to understand the true mechanics of muscles and bones.
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Enduring the stench of decay and swarms of insects entirely alone, he managed to draw the first accurate diagram of the human spine's physiological curvature in history, correctly mapping out the connection points of over 700 bones and muscles.
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Career Timeline: Employers, Projects, and Daily Expenses
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Little-Known Daily Expenses (Clothes, Pets, and Vegetarianism):
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Da Vinci was a notoriously elegant dresser and a strict vegetarian. Surviving household accounts show that he had a strong preference for pink velvet and satin robes.
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His notebooks record his wardrobe expenses: a single custom-tailored pink cloak cost him 15 gold florins, which at the time was equivalent to nearly half a year's total income for an average skilled craftsman.
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He also had a peculiar habit: whenever he walked past bird cages in the market, he would pay the vendor 1 or 2 coins for the asking price, only to immediately open the cages and set all the birds free.
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His True Professional Identity: Leonardo frequently moved between employers throughout his life, and the skill that kept him gainfully employed was usually military engineering, not painting.
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The Military Contract for the Duke of Milan: In his famous job application letter written at age 30, the first 9 points were spent boasting about his military engineering capabilities—such as designing bridges, cannons, armored vehicles, and trenches. Only in the 10th and final point did he casually add, "I can also paint."
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Chief Engineer to the Papal Army: In 1502, he was appointed as the chief military engineer for Cesare Borgia. In just 10 months of rapid marching, he drew highly advanced defense maps of cities like Imola, using an overhead, planimetric view that mirrors modern satellite imagery.
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Extended Work Schedules:
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The Last Supper: Measuring 8.8 meters long by 4.6 meters wide. Because Leonardo refused to use the standard "buon fresco" (wet plaster) technique of his day, he insisted on using an experimental, slow-drying oil-tempera medium he created. This led to him sitting on the scaffolding for an entire day without making a single brushstroke, purely modeling optics and perspective inside his head.
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Mona Lisa: A modest poplar wood panel painting measuring just 77 × 53 centimeters, which he carried with him for nearly 16 years (from Italy all the way to France). He was still making micron-level adjustments to it just a few years before his death.
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Astrid Aillume Insight
Your Source of Straight Answers.
These hidden metrics from old ledger books and X-ray scans paint a picture of a far more human Leonardo:
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He wasn't a wizard; he was an incredibly expensive, delivery-challenged freelance perfectionist. On one hand, he was strolling through the market in a 15-florin pink velvet robe generously setting birds free; on the other hand, he was in his studio pathologically restricting paint layers to a mere 40 microns. This obsessive preoccupation with micro-details is the exact reason he almost never delivered his orders on time to the dukes and popes of Europe.
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His brain functioned like a high-speed multi-core processor, but the numbers show that human biology has limits. Dissecting 30 decomposing corpses, keeping backward journals, and working out complex geometry on the same page required an immense drain on physical time. He didn't have magic; he simply used brutal, uncompromising observation to push the absolute limits of human capability during the Renaissance.