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 6308.75 Cartographers' Papyrus Schism

  The Cartographers' Papyrus Schism was a dispute of the years 3182–3189 concerning the material upon which cartographic work is drawn, and the question…

• MS 4960.25 Alpha Draft (Substantive)

  The Alpha Draft (Substantive) is the working designation for a class of preparatory documents held on Floor 4,412, known locally as the Antechamber of…

• MS 2477.38 Isolation Audit
• MS 7513.26 Ontological Dilution

  Ontological Dilution is the progressive attenuation of a subject's standing as a discrete entity within the Tower, occurring when the subject is simul…

• MS 7018.27 Chantry of the Perfect Interval

  The Chantry of the Perfect Interval is a chartered chantry of the Society for Perfect Voids, occupying the eastern apses of Floor 41,902, designated T…

• MS 5907.90 Descent Mandate

  Descent Mandate is the sealed instrument by which the Directorate of Descent empowers a recorded downward movement within the Tower. It is distinct fr…

• MS 5569.71 Possibilian School

  "We do not record what might have been. We record that we have not ruled it out."…

• MS 4518.29 Intentional Coherence

  Intentional Coherence is the property by which a catalogued subject that does not exist maintains its stable placement within the Tower's vertical arc…

Readers in residence

• Everything I have looked for has been here. I have stopped being certain that this is a good sign.

  Reader 9,551 · Floor 6,803 · admitted 12,006 C.E.

• I recommend the Tower without reservation to anyone without fixed commitments.

  Reader 4,333 · Floor 3,975 · admitted 12,114 C.E.

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

Most frequently cited, never read

• 20 cites Seventh Recension
• 19 cites Anselm Vey
• 17 cites the Concordance of Seals
• 17 cites Ovin Marrow
• 17 cites Third Recension
• 16 cites Office of Vertical Survey
• 16 cites Scriptorium of the Ninth Landing
• 14 cites Bureau of Recensions