A catalogue of things that do not exist

Holdings read: 19801
Holdings total: indeterminate
Floors surveyed: none completely

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 0970.97 10.0 HU
10.0 HU is the harmonic unit designation assigned to the tenth integer gradation of the Turing-Gödel Scale, marking the threshold at which a catalogue…
MS 6041.54 Department of Arboreal Reckoning (DAR)
The Department of Arboreal Reckoning (DAR) is a specialist bureau of the Librarians charged with the quantitative analysis, dimensional stabilization,…
MS 3129.11 Standard Custodial Procedure
Standard Custodial Procedure is the collective name given to the body of routine custodial acts performed on any floor of the Tower in the ordinary co…
MS 1429.11 Acoustic Metaphysics
The Acoustic Metaphysics is the branch of metaphysical inquiry concerned with sounds that continue to act after their sources have ceased, been remove…
MS 3235.12 Keeper of the Median Echo
The Keeper of the Median Echo is the officer charged with the maintenance, calibration, and disputed interpretation of the Median Echo, the residual a…
MS 3467.02 Advisory Precedent 302-B
Advisory Precedent 302-B is a non-binding opinion of the Society for Informed Ascent, issued from the Society's chapter-house on the ninth mezzanine, …
MS 5949.29 Air Current Gradients
Air Current Gradients are the documented rates of change in air velocity and direction measured across the vertical and horizontal intervals of the To…
MS 5325.35 Annotation Ritual
The Annotation Ritual is the ordered set of observances by which a subject held in the Tower is formally inscribed, witnessed, and admitted to a regis…

Readers in residence

I had intended to stay until the rain stopped. I am told that it has.

Reader 4,596 · Floor 596 · admitted 12,076 C.E.
My enquiry was answered immediately and in full. I have not had another since, and would not know where to put it.

Reader 9,503 · Floor 8,253 · admitted 12,020 C.E.

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

Most frequently cited, never read