Leonardo da Vinci is undoubtedly one of the greatest creators in history.

But even as an excellent problem solver he faced an uncomfortable personal problem.
Let's go ahead and say that Leonardo was left-handed. Writing in his notebook, Leonardo used to write with his left hand of course. But pretty quickly he noticed that he was staining the page with ink.
The stains were caused by the writing hand, which smeared the ink that had just been written by her hand. Most of us would probably get used to these stains and live with them in the dark.

Ours pays for our difference. But Leonardo, the man of clusters, the punctual and the researcher, and the one who recorded in his notebooks one of the most amazing inventions in history turned in the opposite direction - he realized that if he wrote upside down, the writing hand would only touch the area on the paper where the ink had not yet been written.

That's why he simply switched to writing rai - instead of writing from left to right, as is customary in Italian and foreign languages, he wrote from right to left. Mirror writing! It worked great. Instead of suffering stains and dirty ink, or causing pain in his writing hand, the genius changed his habits and wrote cleanly and clearly, but upside down. The writing was legible and understandable, but only to him. Along the way, this reversed writing method contributed to a kind of difficulty in reading his ideas.