The Tower catalogues subjects that do not exist. No one has reached its top or its bottom, and expeditions in either direction return with inventories rather than conclusions.

Search for anything. The catalogue will list holdings on it. Those holdings can then be read, at which point they were always there.

Recently read

• MS 4379.25 Office of Ambient Constants

  The Office of Ambient Constants is the standing body of the Tower charged with the promulgation and periodic revision of the Geometric Constants, the …

• MS 5414.01 Subcommittee for Aural Anomalies

  The Subcommittee for Aural Anomalies was a working group of the Librarians, charged with the observation, classification, and — where classification p…

• MS 1413.04 Catalogical Verification Process

  Catalogical Verification Process is the tripartite procedural sequence by which an entity, object, or non-existent subject gains recorded status withi…

• MS 9209.84 Bureau of Displaced Holdings

  The Bureau of Displaced Holdings is the Tower office charged with the reconciliation of objects whose recorded location and observed location do not a…

• MS 5185.91 Ritual of Periodic Verification

  The Ritual of Periodic Verification is the codified sequence of inspections, measurements, and confirmations mandated by the Conditional Existence Arg…

• MS 0677.88 Compendium of Transitory Holdings

  The Compendium of Transitory Holdings is the working register of the Registry of Transitory Holdings, an administrative body of Wing Seven charged wit…

• MS 2746.64 Archival Ledger 45.7

  Archival Ledger 45.7 is a bound archival register of the middle stack, maintained in the north aisle of the Ledger Halls and in continuous service sin…

• MS 6390.19 Acoustic Permeability Index

  The Acoustic Permeability Index (API) is the scalar result of the Acoustic Permeability Test, expressed on a closed scale from 0 to 12 and recorded to…

Readers in residence

• I came for a single ordinance and found it within the hour. I have since consulted eleven thousand further records, none of which I required.

  Reader 4,455 · Floor 4,393 · admitted 12,009 C.E.

• I had intended to stay until the rain stopped. I am told that it has.

  Reader 4,596 · Floor 596 · admitted 12,076 C.E.

Accounts are collected at admission. The Tower does not solicit them on departure.

Most frequently cited, never read

• 15 cites Fourth Scriptorium
• 14 cites the Eleventh Gallery
• 14 cites Osric Vane
• 13 cites Bureau of Contextual Reconciliation
• 13 cites Directive 7-δ
• 13 cites Doctrine of Catalytic Absence
• 12 cites Bureau of Anomalous Topology
• 12 cites Concordances