Per the Mythopoeic Society, Mythopoeic literature is work "that creates a new and transformative mythology, or incorporates and transforms existing mythological material. Transformation is the key — mere static reference to mythological elements, invented or pre-existing, is not enough. The mythological elements must be of sufficient importance in the work to influence the spiritual, moral, and/or creative lives of the characters, and must reflect and support the author's underlying themes. This type of work, at its best, should also inspire the reader to examine the importance of mythology in his or her own spiritual, moral, and creative development." It is creative work that exemplifies "the spirit of the Inklings", a writers circle consisting of J.R.R. Tolkien, C.S. Lewis, and Charles Williams.