"Fantasy changes the world deliberately, allowing impossible things which science fiction at least pretends not to allow. Yes, I say "what if magic worked, and then...," and "what if there were dragons... yes. Then you just follow out, you just follow the fictional enterprise like any novelist, it seems to me, and the more detailed and accurate you are, the better the book will be. And of course, the tricky thing about imaginative fiction, both science fiction and fantasy, is the coherence of the imagination, because you are making a whole world out of words only. It's all made to hold together. Tolkien is very clear about that in some of his essays. He's the best theorist of fantasy I know, actually, Tolkien himself. The European fantasy theorists, Todorov, and those people, they are terrible, terrible. The works they are talking about always seem so insignificant to me. That's not what I mean by fantasy."