Following a head injury, Jason Padget developed extraordinary mathematical skills and a weird form of synesthesia that allows him to see the fractal reality.

According to the artist’s profile, 

“All are HAND DRAWN using only a pencil, ruler and compass.”

After being kicked in the head repeatedly during a mugging:

A scan of Padgett’s brain showed damage that was forcing his brain to overcompensate in certain areas that most people don’t have access to, Brogaard explained. The result was Padgett was now an acquired savant, meaning brilliant in a specific area.”