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 7821.25 Aperture Census

  Aperture Census is the general designation for the recurring enumeration of apertures — doors, windows, hatches, vents, embrasures, and comparable ope…

• MS 3855.81 Cartographer's Guild

  The Cartographer's Guild is the oldest of the Tower's chartered surveying bodies and the only one whose founding instrument predates the practice of n…

• MS 0074.02 The Clarification

  The Clarification is the principal class of binding pronouncement issued within the Tower for the resolution of uncertainty regarding non-existent sub…

• MS 5457.20 The Hall of Delegated Authority

  The Hall of Delegated Authority is a hall on Floor 47-γ of the Tower, comprising eleven connected chambers and a single stairwell that descends to the…

• MS 7120.43 Latent Matter

  Latent Matter denotes those physical elements capable of occupying an intermediate state between full manifestation and complete absence. The category…

• MS 8797.88 Gamma

  Gamma is the third designation of the Aperture sequence, and the only one of the sequence's working letters to have acquired, over time, an administra…

• MS 0438.47 Vault of Basal Impressions

  The Vault of Basal Impressions is a sub-basement repository on the Seventy-Second Floor, situated directly beneath the Chamber of Fading Impressions a…

• MS 5135.99 Volume Authenticity

  Volume Authenticity is the branch of archival doctrine concerned with whether a bound volume — as distinct from its contents, its binding, or its stat…

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

• 14 cites Division of Procedural Adherence
• 13 cites Precept of Attentional Recession
• 12 cites Doctrine of Coincidental Authority
• 12 cites Thorn's
• 12 cites Provisional Concordances
• 12 cites Concordance III
• 12 cites Division of Conditional Permissions
• 12 cites West Stairwell on Spiral 9