Autism and Oughtisms recently wrote about how her son has added new interests over time, without forgetting about the old ones. He went from spinning wheels, to clocks and time, and now to an intense interest in the movement of the planets. If she, who knows him so well, doesn't know for sure what thread connects these interests, I certainly can't. But, as a person with a lifetime of obsessive, seemingly diverse interests linked by a common theme, I can talk about how this worked in my own life. I can't guarantee this story will apply well to any