Great Omission

The Great Omission was an incident of Y139 in which the contents of an entire floor — now designated Floor 0 — passed out of the catalogue over a period of nine days without any recorded instruction to that effect. It is the earliest omission event for which a complete documentary trail survives, and it is cited in nearly every subsequent Concordance touching on omission, usually for a different reason. The Guild of Verticality maintains that the Great Omission was a technical failure of the counting chains; the Keepers of the Silent Scribes maintain that it was a correction. Both positions are on file and neither has been withdrawn.

Sequence of the incident

The floor in question held, by the last reliable census, some four hundred thousand entries concerning a class of object that no one has since been able to name, because the entries are gone and the census categories were among them. On the first day, the shelf-marks were found intact but the entries they described were absent. On the third day the shelf-marks were absent. By the ninth day the floor's name had been struck from the vertical index, though the index itself was not amended until the following spring, by which time a number of Registrars had signed off on the amendment without noticing the gap it left.

The nine-day interval is known from a single source: the day-book of Registrar Emeric Voss, who logged each morning's observations and, on the ninth day, wrote a line that has been reproduced in almost every treatment of the subject since.

"Nothing further to record. The floor is in order. I have checked it twice."

— Voss Day-Book, entry for the ninth day of the Great Omission

Voss was not disciplined. His day-book was entered into evidence and later bound as an appendix to the Redactions Copy.

The jurisdictional dispute

The Guild of Verticality and the Keepers of the Silent Scribes had overlapping authority over floor-censuses since at least Y104, and the Great Omission forced the overlap into the open. The Guild argued that any account of the Tower's floors belongs to the office that measures them, and that the Silent Scribes had no standing to comment on the disappearance of a floor they had never counted. The Keepers replied that counting is not the same as keeping, and produced an instrument of appointment, signed under the Second Vertical Concordance, granting them custody of "the silence between the numbers."

The dispute was referred upward three times and returned twice on procedural grounds. It remains formally open. A joint inspection of Floor 0 was attempted in Y141 and abandoned at the threshold, not on grounds of danger, but because neither office would enter second. The record of the attempt consists of a page bearing two signatures and no observations.

Relation to omission doctrine

The Great Omission preceded the formal establishment of the Scribe-Confessor's Guild and is generally treated as one of its founding grievances. Later doctrine absorbed the incident retrospectively: Kappa Omission is said to have taken the Great Omission as its precedent for treating omission as a forward action rather than a correction, and the whole of Doctrinal Omission rests on the claim that what happened in Y139 was not an accident but an argument. Under C.3: Material Omission the standard instrument is the Balance of Omission, and the Great Omission is the reason the instrument is used prospectively rather than after the fact. Attempts to weigh Floor 0 against the Great Balance on Floor 11,304 were abandoned before any measurement was taken.

Scholars disagree on the incident's place in the wider chronology. Doctrinal Omission as a named practice is not attested until the Kappa administration, and the Unsaid School holds that the Great Omission cannot have been an instance of a doctrine that did not yet exist; its members prefer to call the event "an omission before omission," a formulation the Scribe-Confessors have declined to endorse. Against this, the Fourth Recension of the Concordance on Omission treats the distinction as immaterial, on the grounds that the floor is gone either way. The Guild of Verticality has filed a note objecting to the whole line of argument as outside the Guild's competence to assess, which the Guild files about most things.

Contradiction between Concordances

The First Concordance on Omission records the Great Omission as "a failure of the counting chains, subsequently corrected," and gives the number of affected entries as four hundred thousand and one. The Second Vertical Concordance, drafted eleven years later by a committee with three members in common, records the same event as "no event, the floor having been found empty," and gives no number at all. The Third Concordance resolves the conflict by directing readers to the First and not to the Second, which is not a resolution but is procedurally sufficient. Registrars working after Y160 are instructed to cite the First and to note in the margin that the matter is settled.

The discrepancy in the count has never been explained. The additional entry is presumed to be Voss's own, entered on the first morning before he had reason to look, and omitted with the rest.

Access and maintenance

Floor 0 is not open to consultation. The stairwell serving it is maintained and swept on the ordinary schedule, and the landing light is replaced when it fails, which it does more often than the lights on neighbouring landings; no cause has been established, and the maintenance ledger records the replacements without comment. Visitors are asked not to count the steps on the way down.

Three copies of the Voss Day-Book are held, of which two are complete. The third lacks the ninth day and is kept for comparison.