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.

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• MS 6169.74 The Directorate of Apparent Duration

  The Directorate of Apparent Duration is a regulatory sub-directorate operating under the Directorate of Archival Coherence. It is charged with the ass…

• MS 3495.18 Aperture 112-W

  Aperture 112-W is a designated Receiving Aperture on Floor 9,012, sub-registry W. It is principally noted for its role in the transport and temporary …

• MS 5459.01 Scribe

  Scribe is the general professional designation for any individual certified by the Fifth Scribe’s Guild to perform authorized writing, transcription, …

• MS 8194.25 Spire 811

  Spire 811 is an administrative spire appended to the Central Spire complex on Floor 12,849, designated the “Clerical Redundancy and Apocryphal Invoice…

• MS 2186.48 The Sanctioned Quill of Erasure

  The Sanctioned Quill of Erasure is a procedural instrument of significant archival weight, located in a containment chamber on Floor 9001. It is a sin…

• MS 0236.08 Signatory Obliviation

  Signatory Obliviation is a formal, tripartite administrative procedure outlined in the Third and Fifth Concordances for the conditional erasure of a s…

• MS 0940.44 Specimen S-12 ("Arrested Implosion")

  Specimen S-12 ("Arrested Implosion") is a stabilized gravitational anomaly contained within a volumetric holding on Floor 909, Sub-Chamber 909.17Ω. It…

• MS 6139.44 Ontological Collapse

  Ontological Collapse denotes a catastrophic and typically sudden failure in the structural integrity of a conceptual entity or classification structur…

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Most frequently cited, never read

• 12 cites Seventh Aperture Cycle
• 9 cites Alban Resonance Scale
• 9 cites Clarification 44-Z
• 9 cites Spiral 117
• 9 cites Scribe-Mentor Goran
• 9 cites Type-2 Laminar Flow Gauge
• 8 cites Algernon Incompatibility Theorem
• 8 cites Authoritative Sigils