I also mirror-write efficiently and without thinking.
“Mirror writing is when you write letters or words in reverse, so they appear as a mirror image of the normal writing. This means the letters are written from right to left, and if held up to a mirror, they would appear correctly. It's a common phenomenon in young children as they learn to write, but can also occur in adults due to brain injuries or other neurological conditions.“
No brain injuries here! I’ve just always been able to do it. As an adult, I was showing a friend how I did it, and she asked me if I could write in both directions at once. Yup, can do that too!
It’s quite the party trick!