The Codex Leicester May 2026

Leonardo was left-handed, and it’s believed he wrote this way to avoid smudging wet ink as his hand dragged across the page. To read it, you literally have to hold the page up to a mirror.

But there is another Leonardo. A Leonardo of obsessive curiosity, of messy reverse-script handwriting, and of questions so vast they stretched the limits of 16th-century science. the codex leicester

That Leonardo lives in the Codex Leicester . Leonardo was left-handed, and it’s believed he wrote

Leonardo said: No.

In 1994, the Microsoft founder paid for the manuscript at a Christie’s auction. That’s roughly $500,000 per page. At the time, it was the most expensive book ever sold. (Gates later had it scanned into a digital format for Windows 95 CD-ROMs—a perfect marriage of Renaissance curiosity and digital futurism). Water: The Star of the Show What did Leonardo obsess over in these 72 pages? Water. A Leonardo of obsessive curiosity, of messy reverse-script

He argued that the fossils were proof that the mountains had once been the beds of ancient seas, lifted up over incredibly long periods of time. He realized the Earth was ancient, shaped by slow, relentless processes like water erosion—not a single catastrophe. This put him centuries ahead of modern geology. If you ever get the chance to see the Codex in person (it travels occasionally), you’ll notice something odd. The text is written in Italian, but it’s backwards—from right to left.