When I was twelve years old I thought up an odd trinity: namely, God the Father, God the Son, and God the Devil. My inference wasthat God, in contemplating himself, created the second person of the godhead; but that, in order to be able to contemplate himself, he had to contemplate, and thus to create, his opposite. --With this I began to do philosophy.
When you succeed at creating your own world, whether it's in any realm - like Tolkien was able to do - and people are able to enter that world, it's a special thing.