The Lad's love of the book Goodnight Moon has transformed into an obsession with the moon in general. He points at it on every page of the book. When outside or looking through a window, he is always looking for the moon, and he's become very good at spotting it, even in daylight hours. I think I'm going to encourage this particular infatuation -- books about the moon, etc. Maybe by the time he's an adult, he'll actually be able to travel there.