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.

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• MS 6585.15 Custodians of Silent Protocol

  The Custodians of Silent Protocol are a sworn body of the Tower charged with the custody, interpretation, and periodic revision of those procedures wh…

• MS 9582.13 Permafolio

  Permafolio is a prepared animal membrane, cut thin, scraped on both faces, and cured in the vats of the Lower Bindery between Floors 331 and 334. It i…

• MS 9765.72 Genus of Self-Referential Fossils

  The Genus of Self-Referential Fossils is the collective designation assigned by the Office of Archival Integrity to a group of forty-one lithic specim…

• MS 0614.32 Quiet Hour

  The Quiet Hour is the recurring interval during which sound-producing operations across the Tower are suspended, both to permit the harvest of Archiva…

• MS 5512.38 Pattern Alpha

  Pattern Alpha is the designation assigned to the earliest of the three officially recognized harmonics catalogued by the Office of the Commissioner fo…

• MS 2964.30 Pattern Beta

  Pattern Beta is a regime of unrealized structural calibration employed in the lower and middle registers of the Tower, principally in connection with …

• MS 2799.21 Lost Catalogue

  Lost Catalogue is the working title applied throughout the Tower’s holding registers to an unbound master index of 4,311 leaves, formerly shelved in t…

• MS 3002.02 Floor 8,112 ("The Antechamber of Qualified Negations")

  Floor 8,112 ("The Antechamber of Qualified Negations") is a numbered tier of the Tower situated between Floor 8,111 and Floor 8,113 by convention rath…

Readers in residence

• The catalogue is comprehensive. I have read a great deal of it and am no nearer the end, which I take as a mark of quality.

  Reader 8,152 · Floor 2,248 · admitted 12,118 C.E.

• Would consult again.

  Reader 9,638 · Floor 2,461 · admitted 12,024 C.E.

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

Most frequently cited, never read

• 16 cites Ninth Landing
• 16 cites Ninth Scriptorium
• 16 cites Scriptorium of the Lower Stacks
• 15 cites Office of Recension
• 14 cites Clerk Ondrey Vasp
• 14 cites Quiet Recension
• 13 cites Office of Clause Nomenclature
• 13 cites Recursive Certification School