This is a short and fascinating book which ought to be required reading for anyone interested in autism, or who has some sort of relationship of any kind with someone on the autism spectrum. it was written by a Japanese boy who has this condition, and who painstakingly typed out each letter using a system not dissimilar to the one Stephen Hawking used. It's really quite entrancing to read his inner perspective and his explanations for the things some autism sufferers do.
As I said, it's not a long book, but it makes for engrossing reading. In some ways, it's a bit like reading something written by an alien because his thought process are so altered by his condition that they are truly alien to those of us who do not have this condition. That he was thirteen when he wrote it makes it all the more of an achievement. Highly recommended.