Board of Ontological Thresholds

The Board of Ontological Thresholds is a standing instrumentality of the Tower charged with the identification, certification, and continuing supervision of those thresholds whose crossing alters not the location of the crossing party but the category of thing that party is. It was constituted by the Third Concordance, Annex 9, in a clause of nineteen words that has since required forty-one pages of commentary to interpret and remains, by common consent, uninterpreted. The Board occupies four rooms on a floor whose number is variously given as Vell and 6011, and shares a landing with the Office of Thresholds, to which it is not subordinate but with which it is frequently confused, chiefly by parties who have not yet crossed anything.

The Board maintains no register of people. It maintains a register of thresholds, and the distinction is enforced with a severity that has cost the Tower several expeditions.

Mandate and the Doctrine of Standing On

An ontological threshold is defined in the Board's standing instruction 4-C as a boundary "the crossing of which is not a motion." The definition is circular on its face and was defended at length by Librarian Ostrev of the Ninth Landing, who argued before the Board that a definition of this kind is the only one that does not smuggle in a destination. Ostrev's argument was accepted in 2,904 and has been cited in every subsequent dispute, including seven in which it was cited against the Board itself.

The Board distinguishes its work from that of three neighbouring instrumentalities with which its jurisdiction overlaps. The Office of Weights and Thresholds supervises thresholds expressed in units, and takes no interest in what kind of thing crosses them. The Office of Sealed Thresholds supervises thresholds that must not be crossed, and asks the Board to certify what a party would become if it did, for the record only. The Bureau of Inherited Thresholds supervises thresholds whose authority predates the instrument that assigns it — a category the Board has twice attempted to abolish and twice been prevented from abolishing by the Board of Concordant Interpretation, most recently in The Seventyseventh Clarification.

The Office of Thresholds jointly observes the Master Registry of Proven Connections with the Registrar of Thresholds, a post currently held in commission by three clerks who do not meet. The Board's own entries in that Registry are marked with a slash rather than a dot, which is the only visual indication that the crossing in question was not a movement.

History: the Vell Incident and the Recess

The Board's most studied failure occurred on the Vell floor in the winter of 3,118, when a licensed surveyor named Hesa of the Long Stair crossed a certified threshold carrying a standard inventory of eleven items and returned with the inventory intact, her credentials intact, and her name no longer admitted by the Registry. The Board's ruling of 3,119 held that the crossing had been valid and that the surveyor had therefore not been lost but "reclassified to a designation not presently open." Hesa of the Long Stair is listed in the Board's records under a blank entry that occupies twelve lines.

A subsequent recension of the ruling, issued in 3,121, conceded that the Board had certified the threshold in error — not because the crossing had been wrong, but because the certification had been filed against the wrong annex. The error was corrected. The blank entry was not.

"The Board does not restore. The Board certifies, and where it has certified wrongly it certifies the wrongness."

— Board of Concordant Interpretation, ruling on appeal 77-C

Following the incident the Board entered a four-year recess, during which its quorum was maintained by a single attending clerk, Archivist Penne, who signed nothing and recorded everything. Her notebooks are held by the Curatorial Board and have not been consulted since the Great Re-cataloguing of the Spiral 77 placed them under provisional access restriction.

Procedure and the Two-Clerk Rule

Certification of a new ontological threshold requires the attendance of two clerks and the presence of one witness who has not crossed the threshold and does not intend to. The witness is required to state, aloud and before the crossing, the category of thing they believe the crossing party to be. The statement is recorded verbatim and has never once been found accurate after the fact — a discrepancy the Board regards as a feature of the record rather than a defect in the procedure, and which Dialectical Review Board has twice declined to review.

Certification lapses after eleven years unless renewed. Renewal requires only the signature of one clerk, which has led to a persistent criticism, most recently voiced by Advisory Board memorandum 212, that the Board's thresholds are more durable than the Board's attention to them. The Board's answer, filed and unamended since 3,060, is that an ontological threshold does not become less ontological through neglect.

The Board forbids the carrying of more than nine items across a threshold it has certified. The rule is stated without explanation and is enforced by the attending clerk, who is instructed to count aloud.

Jurisdictional Disputes

The Board's longest-running dispute concerns Segment 14-C, over which the Bureau of Inherited Thresholds filed for exclusive jurisdiction in 3,204. The Board's position is that Segment 14-C is a boundary of category and therefore its own; the Bureau's position is that the boundary's authority is older than the Board and therefore the Bureau's. Both offices continue to certify the Segment. Neither has withdrawn. Parties crossing Segment 14-C are advised by Nomenclature Board circular 9 to obtain both certifications and to carry neither.

A separate dispute with the Board of Temporal Arbitration concerns thresholds that are crossed only after death, which that Board claims as temporal and this Board claims as categorical. The two Boards have agreed to defer the question to the Board of Mandates, which has not convened since 2,988 and whose convening requires a quorum it has never defined.

Present Standing

The Board presently certifies some six hundred thresholds across the Tower, of which an estimated forty are believed by their own clerks to lead anywhere. It publishes no annual report. Its seal — a horizontal line crossed by a shorter vertical one that does not meet it — appears on upward of two thousand documents, several of which are not about thresholds at all and one of which, held in the Materials Board archive, is a laundry inventory.

Requests for certification may be made in person at the four rooms, in writing through the Registry, or by standing at any threshold the Board has already certified and waiting, which is permitted but not recommended.