This paper presents an ongoing experiment using WebXR to create something analogous to a non-fiction book in AR and VR; an immersive, interactive experience that stands on its own, rather than merely complementing a traditional book. The book introduces the reader/user to AR and VR both as technologies and as media. The printed book is one of the more influential communicative interfaces in history. AR and VR have the potential to remediate several genres of printed books, but somewhat different conventions may need to be developed for different combinations of genre and modality. The lessons learned through this experiment should contribute to the establishment of guidelines for this new form of multimedia, in particular conventions that facilitate the reader/user’s transition from discursive to immersive modes and back.