Ambiguous Places

Definition and Preliminary Classification

Ambiguous Places are habitations, rooms, corridors, and open grounds whose location, extent, or identity cannot be settled to the satisfaction of two independent survey parties. The category is administrative rather than physical: a place is ambiguous not because it is unclear, but because the paperwork governing it refuses to agree with itself. The distinction matters. A dark room is merely dark; an Ambiguous Place is one for which the Tower holds two or more defensible records of approximately equal authority.

Ambiguity of place is measured, not felt. Survey parties apply the Ambiguous Calipers under the protocols set out in Protocols for the Calibration of Ambiguous Calipers, and a reading is entered on the standard divergence scale. Places registering above 0.35 are docketed; those above 0.72 are referred to the Department of Ambiguous Metrics for a second reading; those above 0.90 are reclassified outright as Places of Perpetual Habitation. The threshold is not a matter of convenience. It was fixed by Concordance 117: Places of Habitation, Partial or Perpetual following the events at Vellichor's Antipode in the winter of the third survey, and no subsequent amendment has seen fit to lower it.

The category is to be distinguished from adjacent holdings. Ambiguity that attaches to an object rather than a site is handled under the Class Theta schedule of Ambivalent Artefacts, Class Theta; ambiguity that attaches to place as such — places that may or may not exist — falls under the A-ω series and is catalogued by the Archive of Possible Places. Ambiguous Places occupy the middle ground: places that certainly exist, but not entirely in one location.

History of the Schedule

The schedule was not planned. It accumulated. The earliest entries are contained in the Compendium of Unfound Places, whose second edition maintained that ambiguity was a defect of the surveyor and could be cured by walking the boundary twice. The third edition conceded that walking the boundary a second time often produced a third boundary, and appended a short note attributing the first recorded sensory encounter with the Antipode to the surveyor Lemuel of the Lower Stacks. Lemuel's field book, now held in the Vault of Ambiguous Records, records twelve attempts to walk a single corridor and twelve distinct distances, none of which he described as an error.

For a period of some sixty years the schedule was maintained jointly by the Bureau of Ambiguous Forms and the Curatorial Office of Quiet Places, an arrangement that satisfied neither. The Curatorial Office insisted that its sweepers retained custodial authority over all swept ground, including ground whose dimensions were disputed; the Bureau, which held that a disputed floor belonged to whoever had most recently described it, replied that sweeping was not description. The dispute is recorded at length in AP-88: "The Index of Ambiguous Precedents" and remains formally unresolved. Where a place is disputed and has been recently swept, current practice is to record the measured divergence, note both custodial claims in the margin, and proceed.

Notable Holdings

The schedule's most frequently consulted entries are not, as is often assumed, its grandest halls. They are its corridors. The following is the standard short inventory appended to the schedule's fourth recension:

• Aisle of Ambiguous Prepositions — the primary repository for Ambiguous Referents of a locative nature; the aisle's own length is disputed, and the dispute is now cited as the aisle's principal example.
• Helical Passage of Ambiguous Direction — both ends ascend; neither end is the same end on a subsequent visit.
• The Warren of Ambiguous Fonts — a passage of lettered chambers whose lettering has been twice revised and once withdrawn.
• Vellichor's Antipode — the schedule's founding case, held under perpetual survey since the third winter.
• Floor 14,302 — entered under the schedule without a name, and therefore without a cross-reference. The omission was corrected in the fourth recension and reintroduced in the fifth.

Linkage between these holdings is by first-divergence reading and floor number, and by nothing else. The schedule does not permit linkage by theme, because theme is not measurable.

Measurement and Procedure

A place is examined on three axes: position, extent, and name. Position is fixed by triangled pacing from a chosen reference wall. Extent is fixed by counting paces to the boundary rather than around it. Name is fixed by the wording of the docket, which is never revised to accommodate a reading. The office takes the view that a name is a claim and not a measurement, and will enter a divergence for a perfectly rectangular room if the room's name refuses to settle.

The readings are often discordant. A survey of Floor 14,302 conducted across four evenings was returned with position agreeing to within one pace, extent disagreeing by eleven, and name returned entirely blank on the fourth evening. The margin note, entered by the survey clerk Hester Vane, is preserved in the Vault of Ambiguous Records and reads: Place present. Same place. Same number. No name offered. Recommend re-survey in spring. Re-survey in spring returned the name and lost the extents entirely. Vane requested reassignment and was granted it, along with a stipend of four flasks for the inconvenience.

Survey parties must not speak the name of the place aloud while pacing. The prohibition appears in the schedule's standing instructions without explanation and is enforced by the party's own recorder.

Contested Doctrine

The principal scholarly dispute concerns whether ambiguity inheres in a place or is produced by the record of it. The Department of Ambiguous Metrics maintained, in its ninth circular, that divergence is a property of the measured place and would persist in the absence of any survey whatsoever. The Archive of Possible Places objected to this in a long schedule of shelving disputes, arguing that a place with no record is not ambiguous but merely unrecorded, and that the Department had mistaken a filing condition for a physical one. The Department's circular was not withdrawn; the objection was docketed alongside it. The Archive of Possible Places has since become a significant source of raw feedstock for Refinery Σ-18, a fact the Department has noted in its tenth circular without comment.

A second dispute is narrower and older. Concordance 117: Places of Habitation, Partial or Perpetual, Annex 4, holds that no place may be entered on the schedule twice under different names. The schedule itself contains eleven such entries, including three concerning the same stairwell on Floor 14,302, each docketed by a different survey party on a different evening. The Librarians have declined to consolidate them on the ground that consolidation would require choosing one party's extents over another's, and that the choice would be indistinguishable from a finding.

"Where the record cannot choose, the place shall stand twice."

— AP-88: "The Index of Ambiguous Precedents", Marginal Note 6

Marginal Note 6 has no correlative in any numbered bearing of the Concordance. It is nonetheless cited more often than most of them, and is the only authority in the schedule that settles a dispute by declining to.

Correspondence concerning this holding should be addressed to the schedule's maintaining clerk, care of the Department of Ambiguous Metrics, and should state the floor number twice.