This paper presentation approaches Norton Juster’s children’s novel The Phantom Tollbooth as an allegory for interdisciplinary education and research. In the novel’s explicitly allegorical form, as the novel’s protagonist, Milo, journeys through the Kingdom of Wisdom, he is bewildered by the characters he meets, who represent specialized forms of knowledge and are isolated in their own disciplinary silos. Milo doesn’t see any rhyme or reason in the knowledge created by these self-interested characters; indeed, the Princesses Rhyme and Reason are exiled, leaving the land topsy-turvy. Disciplinary divides are evident as the language lovers and math lovers feud and refuse to talk to each other. Meanwhile, the demons of Ignorance guard the castle where Rhyme and Reason live in exile. It is only through the integration and re-unification of knowledge that the demons can be defeated and Rhyme and Reason restored. Additionally, Milo, who is a disaffected and unenthusiastic student at the beginning of the story, is able to find a love of learning and knowledge. Thus, I argue that The Phantom Tollbooth can serve as a guiding light for interdisciplinary practice and a reminder of the urgent need for integration in education and in research.