I guess there may be some of that in why I re-read books, though for me there's also at least a bit of wanting to re-live the story. I suspect this only happens if I can identify with one or other of the characters. This might explain why I'll occasionally re-read Lord of the Flies, all The Dark is Rising books, but only the early Pern Harper Hall books and The Horse and his Boy of the Narnia books. I've yet to feel the need to re-read Lord of the Rings.
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I guess there may be some of that in why I re-read books, though for me there's also at least a bit of wanting to re-live the story. I suspect this only happens if I can identify with one or other of the characters. This might explain why I'll occasionally re-read Lord of the Flies, all The Dark is Rising books, but only the early Pern Harper Hall books and The Horse and his Boy of the Narnia books. I've yet to feel the need to re-read Lord of the Rings.