When Was Mirror Writing Invented?

The first book includes the notes taken by Leonardo from 1487 to 1490 in Milan and the ones written in Florence in the end of his life, around 1505.

Who started mirror writing?

Not only did Leonardo write with a special kind of shorthand that he invented himself, he also mirrored his writing, starting at the right side of the page and moving to the left.

Is mirror writing normal?

An uncommon form of writing, mirror writing is seen among healthy individuals, but it can also follow a variety of neurological diseases; it is nearly always carried out with the left hand and is more easily undertaken by left-handers.