The Librarian is an aging resident who has spent his entire life wandering the endless hexagonal rooms. He expects to die soon and be thrown down the central shaft of a hexagon, where his body will fall indefinitely. He holds a deep, quasi-religious belief that the endless chaos of books must contain some underlying order. Rather than despairing at the nonsensical texts surrounding him, he maintains an elegant hope that the books repeat themselves infinitely to form a pattern.

The Library is a seemingly sentient, god-like entity that encompasses the entirety of the known universe for its inhabitants. It consists of interlocking hexagonal chambers, spiral staircases, and shelves containing every possible combination of twenty-five orthographic symbols. Its sheer vastness and chaotic comprehensiveness offer tantalizing promises of universal truth while actively preventing anyone from ever finding it.

Letizia is a commentator referenced in a footnote regarding the physical structure of the universe. She theorizes that the endless physical expansion of books and shelves is unnecessary. She suggests instead that a single volume with an infinite number of infinitely thin pages would serve the exact same purpose.