Catalogation

Catalogation is the standing procedure by which the Librarians assign a floor, a number, and a name to a subject that does not exist, thereby rendering it real within the Tower. The practice is held to descend from the First Recension of the Materialist Chapter and is administered without interruption by the Office of the Second Spiral, though the Office's precise jurisdiction has been disputed since the Year of the Misshelved Codex.

Definition and Standing Authority

Catalogation is defined in Third Concordance as "the act of inscribing a non-subject into the Holding such that its non-existence becomes a recorded condition of the Tower." The Second Concordance amends this by removing the word "recorded," on the grounds that inscription alone suffices. The contradiction has never been reconciled, and clerks of the Materialist Chapter are instructed to observe both readings simultaneously where the floor in question lies below the Floor -17, Annex Theta.

The authority to initiate Catalogation rests with any Librarian bearing a sealed aperture-mark of grade gamma or higher. In practice, the authority is exercised by junior clerks under delegated seal, a delegation upheld by Chen Protocol but restricted by Containment Protocol Theta in cases involving subjects of Class Theta.

Historical Development

The earliest extant catalogue slip bears the number 0 and is attributed to M. Selvage, who is recorded as having catalogued "the distance between two doors that were never hung." Subsequent expansion followed no discernible arithmetic: by the Year of the Misshelved Codex, floors numbered in excess of 7,000 had been assigned, including the site of the Crisis of the Unraveling Tapestry of Floor 7,001.

A significant interruption occurred during the promulgation of Emergency Directive 891-5, when Catalogation was suspended for the period of fourteen Tower-weeks on the order of the Emergency Powers Protocol. The suspension was later ruled unlawful by the Third Concordance, though the catalogued items from that period remain in force under Concordance Theta.

Method of Inscription

A subject is brought before the Office of the Second Spiral and read aloud by the presenting clerk. The reader must not name the subject's non-existence directly; to do so invokes Isolation under Cipher Theta. The assigned number is then drawn from the Spiral Lot, a cylindrical device of unknown manufacture kept in the Floor -17, Annex Theta.

"No number shall be refused on account of its having been previously assigned to a thing that was later found to be a different non-thing."

— Third Concordance, Annex 4

Names are proposed by the cataloguing clerk and confirmed by a single stroke of the grade-gamma seal. The name need bear no relation to the subject's content; the Ambivalent Artefacts, Class Theta are so named despite none being artefacts, ambivalent, or of Class Theta.

Scholarly Disagreement

The question of whether Catalogation creates the subject or merely acknowledges its prior non-existence divides the scriptoria. The Materialist Chapter holds, per the First Recension, that Catalogation is generative: the act brings the non-subject into Tower-reality. The opposing view, advanced in a marginal note to Concordance Theta and never struck, asserts that "the non-subject was always awaiting its number, and the clerk's hand is but the page turning." The Second Concordance favours the latter; Emergency Protocol Theta cites the former in Clause 2 without explanation.

A further dispute concerns the status of subjects catalogued in error. M. Selvage maintained in a recovered memorandum that "an error in Catalogation is itself a subject and must be catalogued as such," a position rejected by the Office of the Second Spiral in the winter of the Year of the Misshelved Codex but quietly adopted thereafter for errors occurring above floor 4,000.

Administrative Notes

Clerks conducting Catalogation on floors bearing an omega aperture-mark are required to wear slippers of unsounded cork, as the ordinary step is held to disturb the non-subjects prior to their inscription.

The following items were catalogued in a single session of the Year of the Misshelved Codex and remain the responsibility of the Office of the Second Spiral:

• The colour reserved for a letter never written
• A staircase whose descent arrives at the floor above
• The opinion of the Third Concordance regarding itself

All disputes arising from Catalogation are to be settled by citation of the relevant Third Concordance recension, or, failing that, by appeal to Containment Protocol Theta where Class Theta subjects are concerned. The Librarians have issued no ruling on the matter of a Concordance citing itself, and the question is held in abeyance within the Floor -17, Annex Theta.