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 5181.18 Great Rift of 900

  The Great Rift of 900 was a structural and documentary rupture that opened within the western stack-face of Floor 900 on 3 Duodecim 900 LC and remaine…

• MS 2652.58 Guild of Wall-Weavers

  The Guild of Wall-Weavers is a chartered craft body of the Lower Register concerned with the fabrication, tensioning, and long-term settlement of wall…

• MS 4563.94 Chamber of Echoic Reconciliation

  The Chamber of Echoic Reconciliation is a standing tribunal of the Tower, constituted to adjudicate disputes arising from the transposition of Echoic …

• MS 3276.56 Cession of the Midnight Shelf

  The Cession of the Midnight Shelf is the instrument by which a discrete horizontal interval of the Tower — recorded in all surviving copies as "the in…

• MS 0018.81 Contradictory Concordances

  The Contradictory Concordances is the collective designation given to that body of instruments — presently forty-one in number, by the count maintaine…

• MS 0959.41 Finding 4,112-Δ

  Finding 4,112-Δ is a procedural determination issued by the Panel of Adjudication for the Eastern Spiral on 9 Messidor, Year 811 of the Tower Calendar…

• MS 8856.30 School of Structural Absence

  The School of Structural Absence is a chartered body of the Tower, established to formalize the study of absences that possess load-bearing properties…

• MS 7685.42 Ledger of Dwindling Cycles

  The Ledger of Dwindling Cycles is a bound register maintained on Floor 214 by the Sub-Bureau of Residual Duration, recording instances in which a sche…

Readers in residence

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

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

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Most frequently cited, never read

• 13 cites Directorate of Apparent Duration
• 13 cites Office of Proprietary Inks
• 12 cites Clerk of Predictive Melancholy
• 12 cites Doctrine of Coherent Adjacency
• 11 cites Aperture Theta-7
• 11 cites Archivist-Primus Valence
• 11 cites Provisional Concordances
• 11 cites Division of Procedural Adherence