Spires

The Spires constitute an indefinite series of floors located above Floor 7422, beginning at the aperture designated 7422-alpha and continuing upward through a sequence of openings, stairwells, and vertical shafts that has never been surveyed to a fixed terminus. The series is not a single structure but a class of adjacent structures, each plated or bonded in a manner consistent with sanctioned vertical construction, and each administered — nominally, and often contentiously — by whichever body holds the relevant designation for that floor. Expeditions from Floor 7422 have returned with inventories of the first eleven apertures and no conclusions regarding the twelfth.

No horizontal boundary of the Spires has been certified. The Metrological Spires have declined to issue a retention interval for the upper series on the grounds that no Certified Timestamp can be attached to spaces whose floors are entered but not numbered in sequence. The Third Concordance addresses the matter at Annex 9, requiring only that "any floor above the seven-thousand-four-hundred-and-twenty-second be entered on a list, and that the list be sealed" — a requirement that has been met repeatedly without resolving what the list describes.

Designation and administration

Designation of vertical structures as Spires falls to the Office of the Twenty-Third Spire, which maintains the register of sanctioned apertures and the seals affixed to each. The Office's register has been amended four hundred and eleven times since the aperture-count was fixed at eleven; of those amendments, three hundred and eighty-nine correct earlier amendments rather than record new construction.

Administrative authority over the Spires is divided among several networks. The Metrological Spires jointly administer the Archival Spires with the archival floors and certify timestamps for all retention intervals recorded within them. Iron Spires are the communication spires plated with telluric iron where the Signal-Beaters' Guild performs manual harvesting of residual semiotic energy. Foundational Spires are the more common structures within this part of the Tower and remain in administrative conflict with the Iron Spires over aerial causeways, drift resources, and protocol precedence — a conflict documented at length in the records of the Custodial Spire and touched upon in Load Distribution.

Disputes between these bodies are settled by citation of a Concordance, a practice that has produced a body of case law considerably longer than the Concordances themselves. In the winter of a year the register does not record, Clerk Amarin Hold was tasked with reconciling the apertures list against the Foundational Spires ledger. After eleven weeks Hold submitted a reconciliation of two pages: one showing that both ledgers referred to the same eleven apertures, and one stating that no further reconciliation was possible. The second page was sealed unread.

The communication doctrine

Iron Spires pass signals and forget them, contrasting with Archival Spires, which receive, file, and return a receipt. This distinction, though simple in statement, has generated a prolonged disagreement between the two networks. The Iron Spires argue that the Spires proper — that is, the structures above Floor 7422 — fall within the communication class, since signals entering the upper apertures are not retained at any point of passage. The Archival Spires counter that the receipt is returned by the Spire, not by the sender, and that the Spires above 7422 have never been shown to return a receipt. Whether this silence constitutes forgetting or a failure of delivery is the subject of a standing motion before the Custodial bench, first tabled in the Fourth Concordance, Annex 2, and never voted upon.

"What is not receipted is not filed; what is not filed is not held; what is not held may still be Spires."

— Fourth Concordance, Annex 2, marginal gloss

Recorded incidents

Three matters concerning the Spires are entered in the general register. The first is the Whispering Iron episode, in which a section of telluric plating above aperture 7422-delta was found to carry residual voice in a manner inconsistent with sanctioned harvesting. The Signal-Beaters' Guild submitted that the plating had not been authorized for harvest and therefore could not be whispering; the Office of the Twenty-Third Spire submitted that the plating had been authorized for harvest under a seal issued eleven years previously and mislaid. The record does not resolve which submission was accepted.

The second is the discovery of the Spire of Unfinished Catalogues, whose nine floors are held by some to be the highest known continuation of the series and by others to be a separate structure entirely, on the grounds that its stairwells turn counter to the direction established at 7422-alpha.

The third is the Echo-Spires of Myn, which the register lists under "echo" and does not attempt to place.

The Vael attribution problem

Scholarship attributes the doctrine of foundational verticality chiefly to Archivist-Luminary Vael, whose writings on the lower Spires remain the standard authority for much of the registry. The attribution is disputed by the Librarians of the ninth annex, who note that Vael's second recension treats the Spires as a class and the first as a series, and that neither recension mentions the floors above Floor 7422 at all. A third body, citing the Spire Edicts in the corrected recension, maintains that the Vael attribution was itself a later insertion made to give the Foundational Spires a pedigree in their dispute with the Iron Spires.

No one has proposed that the dispute be settled by examination of the floors themselves. The customary reason given is that the Spires above 7422 remain unsurveyed. The practical reason is that only one stairwell at 7422-alpha is open, and it is reserved for the inventory parties.

Access

Entry to the Spires requires a sealed aperture-list countersigned by the Office of the Twenty-Third Spire and a witness from the Metrological Spires who remains at the aperture until the party returns. The witness may bring a stool. Parties ascending beyond the fourth aperture are asked not to count the stairwells aloud, as this has been found to disturb the register.

Visiting surveyors must leave their boots at the aperture. The custom is not recorded in any Concordance and is enforced by the witness.