Naming and counting is inspired by passages in the Gospels of Matthew and Luke which say that God has numbered every hair on our heads and that God is aware of every sparrow that falls. In her book The Rock That Is Higher, L'Engle mentions this concept, and the interdependency that is at the heart of A Wind in the Door: The title is based on a quote from Le Morte d'Arthur. Story development The novel grew out of a short story, "Intergalactic P.S. 3", first published as a pamphlet for Children's Book Week in 1970. In this early version of the narrative, Mrs Whatsit, Mrs Who and Mrs Which from A Wrinkle in Time send Charles Wallace, Meg and Calvin to a school on another planet, where Proginoskes and a conifer seed version of Sporos are among their classmates. As in the novel, Meg must identify the real Mr. Jenkins among his two impostors. If she fails, it will be "a victory for the Dark Shadow" (i.e. the Black Thing). In Walking on Water: Reflections on Faith and Art, L'Engle states that at one stage in the writing of A Wind in the Door, she knew who most of the characters would be, including Progo, the snake and "the three Mr. Jenkinses." She had difficulty developing the story, however, until a physician friend gave her two articles about mitochondria. "And there was where the story wanted me to go," L'Engle writes, "away from the macrocosm and into the microcosm." Enlisting the help of her elder daughter, she proceeded to give herself "a crash course in cellular biology," which she found to be hard work, but also a lot of fun. Reception At the time of the book's publication, Kirkus Reviews said, "The audacity of Ms. L'Engle's mytho-scientific imagination and her undoubted storytelling abilities keep the reader involved in Meg's quest, but one wonders whether its chief appeal doesn't lie in the all too natural desire to believe that our difficulties, like the Murrys', are personal attacks by the forces of cosmic evil... Unfortunately, Meg learns to love the universe with unconvincing ease, and L'Engle seems to be straining unusually hard to relate what's wrong with America to the double-talk phenomenon of mitochondria and farandolae." Michele Murray wrote in The New York Times, "Madeleine L'Engle mixes classical theology, contemporary family life, and futuristic science fiction to make a completely convincing