Who is Jos from The Man Who Mistook His Wife for a Hat and Other Clinical Tales and what is their importance?

José is an autistic man who has the ability to render unique drawings. A watch becomes something more than a simple pocket watch when José draws it. José is thought of as an idiot by the hospital staff but Sacks takes time to work with the young man and engage his artistic ability. José eventually begins to speak and even his drawings become more profound as if he is trying to communicate through his art.