ONCE upon a time, a tree started to grow on a boy’s head. It just happened naturally; it was spring after all. But it’s one thing for a tree to grow in the countryside and quite another for it to grow on a boy’s head. Imagine the problems this would create-for example, when watching a movie, a play or a circus show, or riding a bus, and, of course, at school. So the boy started to hide his tree under a woollen hat. But with summer approaching and the tree still growing, he wasn’t able to hide it any longer. And when the town found out the truth, everyone was shocked. Was there a danger this could spread to other children? To the rest of the town? Just in case, the town decided the boy should stay home for the remainder of the school year...