The oft-made claim that The Chronicles of Narnia is an allegory, though partially true, does not quite do justice to the power of the work, or the beautiful, grace-filled, and luminous world Lewis creates. In a work of allegory, as Lewis explains it in The Allegory of Love, characters are visibilia ("visible things") invented to express or represent certain "immaterial facts" about the world of our experience, such as our passions or states of...