Spiral 72 Aperture Delta

Overview

Spiral 72, Aperture Delta is a north-facing aperture on the Delta stack, conventionally reckoned by the Office of Vertical Survey as lying between the lower registers of Spiral 74, Aperture Delta and the upper approaches to Spiral 44, Aperture Delta. It is a small aperture by the standards of the Delta stack — eleven landings, a single stairwell, and a counting-room — and it has never administered anything larger than itself. Its importance, such as it is, derives entirely from a jurisdictional peculiarity: Spiral 72 is the only aperture in the Delta stack whose number appears on neither face of the doorway. The lintel reads 71 on the ascent and 73 on the descent. Spiral 72 is named only in the ledger.

Visitors are advised to keep to the counting-room and not to adjust the numbering plates. Aperture Ordinance 44-c states that "no person shall alter, shim, or reletter a landing marker without the countersign of the Warden of the Delta Stack," and the plates at Spiral 72 have twice been shimmed anyway.

The numbering dispute

The aperture's dual identity was first noted in the survey returns of 3,904 by a junior surveyor, H. Corvel, who recorded the ascent face as 71 and the descent face as 73 and filed both under "irregularities, minor." Corvel's supervisor, Surveyor-Adjutant Pellam Oreth, struck the irregularity on the grounds that "a doorway seen from two sides is still one doorway, and a doorway does not change its name because one has turned around" (Oreth, Notes on the Delta Returns, fol. 212). The aperture was consequently given a third designation, 72, to avoid favouring either face. It has been the source of correspondence ever since.

The Eleventh Concordance holds that an aperture "takes the number of its lowest attested face," which would make the subject Spiral 71. The Fourteenth Concordance, Annex 3, reverses this without comment, assigning to each aperture "the number borne upon the face by which it is entered," which would make the same aperture 71 to arrivals from below and 73 to arrivals from above. The counting-room keeps both readings in separate ledgers. Neither has been reconciled.

Administration

Spiral 72 is administered as a dependency of Spiral 74, Aperture Delta, which supplies its stationery, its lamp oil, and its two-man night watch. Because Spiral 44, Aperture Delta is the primary access point for the southern registers, however, all personnel transfers into Spiral 72 are routed through Spiral 44 and countersigned there, a duplication that the Bureau of Inter-Spiral Movement has defended on the grounds that "an aperture with two faces may reasonably expect two signatures." The arrangement produces roughly forty redundant countersignatures a year, all of which are filed.

The counting-room holds the Delta Tally, a running register of the stack's aperture heights maintained without interruption since 2,880. The Tally is not consulted for navigation. It is consulted when the Office of Vertical Survey and the Bureau of Inter-Spiral Movement disagree about a height, at which point both offices cite it and interpret it differently.

The Corvel grievance

Corvel's original irregularity slip was never destroyed. It resurfaced in 3,941 during an audit of the Delta stack and was entered into the record, which had the effect of formally acknowledging the discrepancy that the aperture had spent thirty-seven years declining to acknowledge. Corvel, by then a Senior Returns Clerk at Spiral 19, Aperture Delta, petitioned for the return of the slip as personal property. The petition was refused by the Office of Records Retention on the grounds that a document's author retains no claim upon it once it has been filed, a ruling later upheld under the Nineteenth Concordance, clause 8. Corvel's subsequent request that the slip at least be filed under his name rather than under "irregularities, minor" was granted in part: it is now filed under both.

"The slip is not the clerk's. The slip is the aperture's. The clerk was merely the instrument by which the aperture came to know itself."

— Office of Records Retention, ruling of 3,941

Access and the Spiral 117 interface

Although Spiral 72 maintains no independent materiel capacity, Spiral 117, Aperture Delta lists it among the apertures through which contiguous systems may route small consignments, principally because the counting-room is willing to sign for things. In practice this means the aperture receives crates addressed to other floors and holds them until someone collects them. The counting-room's standing instruction, posted inside the door, is that uncollected crates are to be moved to the lower landing after sixty days. No crate has ever been moved to the lower landing, because the lower landing is where the numbering plates are, and no one wishes to be seen there.

See also

• Aperture Delta
• Gamma-Delta Intersection Event of '73
• Stack Delta-5
• Hepatic Delta