What really happens is that the story-maker proves a successful 'sub-creator'. He makes a Secondary World which your mind can enter. Inside it, what he relates is 'true': it accords with the laws of that world. You therefore believe it, while you are, as it were, inside. The moment disbelief arises, the spell is broken; the magic, or rather art, has failed. You are then out in the Primary World again, looking at the little abortive Secondary World from outside.
J. R. R. TolkienFantasy (in this sense) is, I think, not a lower but a higher form of Art, indeed the most nearly pure form, and so (when achieved) the most potent.
J. R. R. TolkienFool of a Took!" he growled. "This is a serious journey, not a hobbit walking-party. Throw yourself in next time, and then you will be no further nuisance.
J. R. R. Tolkien