If kids like a picture book, they're going to read it at least 50 times. Read anything that often, and even minor imperfections start to feel like gravel in the bed.
“I have had issues with depression all my life, and it's probably true to say there was a tendency towards it even when I was very young, during my schooldays. There was often - and this is quite common with comics - a sense of not feeling as if I belonged anywhere.”