a world can't refer outside of itself..therefore consistency is a foundation of indirect referral. remember - a world only has itself as a reference. as in narnia, each world has distinctive features, and everything is redefined by it's context. For example, although the princess of Charn is a tall (actually the tallest) woman of Charn, she is and all humans pale in comparison to any of the people that are on the chairs in Charn. And in Narnia, where all of the animals can talk, Strawberry who used to be on Earth can talk.