I recall either seeing something on TV, or a website, about some guy who was I believe an autistic savant, or something like that. I could be totally mistaken about that. But I do remember that he was a recluse who lived in a crummy apartment and I think he was a janitor or some other low-level job.
Anyway, it turned out that he had created this amazingly detailed children’s fantasy universe, complete with really beautiful illustrations. Dragons, fairies, etc, I think I recall seeing. He had sort of invented this fantasy life for himself and lived in it through his artwork.
Who was this guy? Is he still alive?