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Moomintroll goes through all kinds of downs, he gets depression, identity crises and so on. Other characters go through midlife crises, or have OCD and so on.
And the kids actually responded on that. She stated, that she got many letters from kids who were timid, anxious and lonely. She herself said this:
"In every honest children's book, I think there is an element of fear. Anxious and self-confident children alike are unconsciously drawn to it, and to destruction."
