Most kids don't believe in fairy tales very long. Once they hit six or seven they put away "Cinderella" and her shoe fetish, "The Three Little Pigs" with their violation of building codes, "Miss Muffet" and her well?shaped tuffet—all forgotten or discounted.And maybe that's the way it has to be. To survive in the world, you have to give up the fantasies, the make?believe.