Rule of the labyrinth

The library of the unnamed abbey is not merely a repository of books but a labyrinth, a physical embodiment of the principle that knowledge must be guarded by confusion. The Rule of the Labyrinth is the hidden architectural logic that governs this space, a system designed to make the library impenetrable to all but the librarian and his assistant. It is a rule of perfect order that produces perfect disorientation, a paradox that William of Baskerville must unravel to solve the series of murders that have plagued the abbey.

Architecture and Geometry

The labyrinth is built on a precise mathematical plan. The Aedificium, the octagonal construction that houses the library, is described by Adso as having a quadrangular form with a heptagonal tower at each corner, five sides of which are visible from the outside. This creates a structure of fifty-six rooms: four heptagonal rooms at the center of each tower and fifty-two more or less square rooms. Of these, eight are windowless, twenty-eight look to the outside, and sixteen look onto an internal octagonal well. The windows are arranged so that each wall has two, and each tower five, a pattern that William uses to deduce the internal layout. The central well, visible from the kitchen and scriptorium, is octagonal, and on each of its sides there could be two windows, suggesting two internal rooms per side. This geometric harmony, as William explains, is a celestial harmony to which various and wonderful meanings can be attributed, but it is the arrangement of the openings that creates the labyrinth's confusion.

The Experience of Disorientation

The rule of the labyrinth is experienced as a deliberate assault on the senses. The rooms are not arranged in a simple, linear fashion; some have two doorways, others three, and some lead to blank walls. The verses from the Apocalypse painted on the walls, such as "Super thronos viginti quatuor" and "Nomen illi mors," are not unique to a single room but repeat in different locations, offering no reliable clue. Mirrors, like the one in the room with the inscription "Super thronos viginti quatuor," distort and enlarge images, causing intruders to mistake their own reflection for a ghost. Vision-inducing herbs are burned in lamps, producing hallucinations of serpents and headless men. The ventilation system, with slits placed at certain angles, creates gusts of wind that produce moaning sounds, further terrifying the foolhardy. As William observes, the maximum of confusion is achieved with the maximum of order, a sublime calculation by the builders.

The Navigational Principle

To navigate the labyrinth, William must reconstruct its rule from the outside, using the mathematical sciences. He realizes that the library was built by a human mind that thought in a mathematical fashion, and therefore he must compare his own mathematical propositions with those of the builder. By examining the exterior of the Aedificium and counting the windows, he deduces the internal arrangement of rooms. He then formulates a method for finding the way out, citing an ancient text: at every new junction, the path taken is marked with three signs; if a junction has already been visited, only one mark is made on the path taken; if all apertures are marked, one must retrace one's steps. This rule, though imperfect, provides a systematic approach to a space designed to defeat it. The ultimate key to the labyrinth, however, is not a navigational algorithm but a symbolic one: the verses from the Apocalypse are not merely decorative but form a text, with the initial letters of each verse spelling out the names of the regions of the world—HIBERNIA, YSPANIA, LEONES, IUDAEA, AEGYPTUS—corresponding to the origin of the books housed in each section.

Thematic Significance

The Rule of the Labyrinth is a metaphor for the novel's central themes: the relationship between order and chaos, knowledge and power, and the limits of human reason. The library, a monument to learning, is also a prison for that learning, its very structure designed to conceal and control. The labyrinth is a symbol of the world itself, as Alinardo of Grottaferrata recites: "Hunc mundum tipice labyrinthus denotat ille." William's struggle to understand the labyrinth mirrors his broader philosophical struggle to find order in a universe he suspects may be without it. The rule is a testament to the pride of the intellect, a human attempt to impose a perfect, closed system on the infinite and unknowable, an attempt that ultimately leads to destruction. The labyrinth, in its perfect order, is a lie, a human construct that crumbles when confronted with the messy, unpredictable reality of human passion and sin.