Oh! I almost forgot. Nar one of our Downs friends, has posited two different types of fantasy: transition and immersion. Immersion is the kind where you are in a world other than ours from the get-go. Transition is the kind where you start in current Earth time and move into another world, be it Faerie, a different planet, place, time, what have you. It is NOT the case that ALL fantasy is immersion.
Stephen Lawhead's Albion series is transtional. Pullman uses both. Tolkien, of course, is immersion, but started writing the whole thing as a transitional time-travel story.
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