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 5095.47 Primary Nullification

  Primary Nullification is the foundational class of Nullification under Tower doctrine, comprising those holdings whose removal from the catalogue is a…

• MS 9661.27 Standard Protocol Ratification

  Standard Protocol Ratification is the conferral of Tower validity upon a document that has already been drafted, circulated, and read aloud once witho…

• MS 4693.21 Spiral Alpha through Spiral Iota

  Spiral Alpha through Spiral Iota is the collective designation for the nine primary spirals that radiate from the Atrium of Unattributed Voices on Flo…

• MS 6198.23 Provenance of the "Weeping Staircase"

  Provenance of the "Weeping Staircase" is the branch of archival inquiry concerned with the origin, transmission, and jurisdictional genealogy of recor…

• MS 8141.91 In re Acoustic Propriety, Sub-Spiral 94-Gamma

  In re Acoustic Propriety, Sub-Spiral 94-Gamma is the binding determination issued by the Sub Basement Jurists on 23 Sable 31 (docket 94-G/Ac-7) design…

• MS 8273.42 Semantic Field Uniqueness Density (SFU-D)

  "Where the semantic field of a holding overlaps that of its neighbour, we do not count two holdings but one holding twice, and the density falls accor…

• MS 9258.10 Intentional Overwrite (The "Librarian's Prerogative")
• MS 6138.97 Concordance 14, Section 9

  Concordance 14, Section 9 is the section of the Fourth Concordance governing the custody, transfer, and permitted decay of unclaimed vertical distance…

Readers in residence

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

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

Most frequently cited, never read

• 17 cites Registry
• 17 cites Bureau of Validation
• 17 cites Eleventh Recension
• 16 cites Ninth Landing
• 15 cites Directive 14,899-δ (Framework for Cataloguing Persistent Referential Gaps)
• 15 cites Ordinance Beta-7
• 15 cites Vault of Binding Precedents
• 14 cites Concordance of Precedents