His notebooks aren't necessarily a masterpiece (of literature).
Leonardo's notebooks were actual notebooks, meaning that is where he sketched stuff, wrote down his ideas, drew his designs and even made notes about his personal finances. Leonardo's notebooks are a candid record into his life.
Leonardo da vinci coded his notebook so that, in years to come, nobody would be able to steal or copy his ideas.
He did this cleverly by writing everything backwards.
Answer 2:
The above is one theory, but not the only one.
It may just be that being left-handed Leonardo found mirror writing comfortable. And mirror writing is easily legible by means of a mirror.
Some code!
In his notebooks
His great imagination and curiosity.
Paintings and inventions.
Leonardo Da Vinci
No, my friend. That was Leonardo da Vinci.
About 1587.
In his notebooks
His great imagination and curiosity.
Paintings and inventions.
Leonardo da Vinci wrote most of his personal notes in mirror writing. Most of his notebooks were written in mirror writing.
The airport code for Leonardo da Vinci-Fiumicino Airport is FCO.
Leonardo Da Vinci
No it was NOT Leonardo Da Vinci, It was Dan Brown, and he was American.
That he wrote backwards ("mirror writing").
Leonardo da Vinci
No, my friend. That was Leonardo da Vinci.
It has nothing whatever to do with Leonardo's life.