CVAs

CVAs, or Verified Ambient Absences, are the certified units in which the Canon of Preserved Absences records works that are no longer held, never were held, or are held elsewhere in a condition that cannot be confirmed. A single CVA denotes one absence, verified by two attending Catalographers and countersigned by a Duty Librarian of the Academy of Perceptual Absences. The Canon currently registers 7,412 CVAs, a figure that has remained constant since the Reckoning of the Ninth Landing (year not agreed; see below) despite continuous accession and occasional loss.

The distinction between a CVA and a mere gap in the catalogue is jurisdictional. A gap is an error and is corrected. A CVA is an error that has been examined, found to be stable, and granted standing. Ottilie Vant, junior Catalographer, argued in her 28-page marginal memorandum of the winter of the third recension that inert CVAs — those that provoke no further accession activity — "constitute the entire point of the Object, the rest being paperwork in motion" (Vant, Memorandum on Inert Absences, fol. 11r). The memorandum was not adopted. It has not been withdrawn.

Procedure and the Two-Witness Rule

Verification proceeds by attendance. Two Catalographers present themselves at the shelf, bay, or designated void where the absence is said to reside and independently attest that nothing is there. Under Fourth Concordance, Annex 2, clause 7, the witnesses may not confer before attesting; under Sixth Concordance, Annex 2, clause 7 (identically numbered, differently worded), they may confer but must record the conference. Both clauses remain in force. In practice most stations resolve the conflict by having the witnesses confer in writing only, a compromise the Bureau of Amended Practice has twice declined to ratify and never once prohibited.

Certain absences cannot be attended. Works missing from sealed floors, from floors whose numbers are disputed between two sectors, or from the Chamber of Atonal Harmonics during tuning are verified remotely, by two Catalographers standing at the stairhead and agreeing aloud. The Dissent of Clerk Anselm Marrow (recension 4, item 19) records the objection that this practice "verifies the stairhead and not the absence," a criticism that has never been answered and is reprinted in every subsequent edition for that reason.

Measurement and Bibliostatic Pressure

CVAs are not merely counted; they are weighed against the building. Manual of Latent Topography, Manual 7.3 standardises the use of CVAs for measuring Bibliostatic Pressure, treating each verified absence as a fixed unit of relief against the load exerted by present holdings. A floor dense with books and equally dense with CVAs may be certified at equilibrium and left undisturbed for a century. A floor dense with books and empty of CVAs is scheduled for Burden Examination at the earliest convenience of the Manual Porterage office, which is to say eventually.

The measurement is not without hazard. During the survey of Floor 201, a chain of eleven CVAs was recorded along the north wall and the floor's pressure reading fell by a third overnight. The survey was suspended, the readings impounded, and the wall re-examined. No books had moved. The Senior Surveyor's note of the period holds only the line "the absences were doing something" (Survey of Floor 201, interim folio, unnumbered). The interim folio remains under seal.

The Fixed Count

That the Canon registers 7,412 CVAs and has registered 7,412 CVAs through four recensions and an interval of unstated length is the subject of the longest-running dispute in the Object's history. The Dialectical Archivists maintain that the count is exact and that accession and loss offset one another by design, each new absence displacing an older one into an unregistered condition the Archivists call "the slack." The Office of Continuous Enumeration rejects this as arithmetic mysticism and holds that the count has simply not been audited since the Reckoning of the Ninth Landing, an event whose date the Office declines to fix on the grounds that fixing it would require counting the years, and the Office does not count years.

A third position, advanced by the Guild of Shelfwrights and largely ignored, notes that many accessions are duplicates — the same missing work verified again on a different floor — and that if duplicates were struck the Canon might hold somewhat fewer than 7,412 absences, or somewhat more. The Guild has been asked to specify which. It has not.

Notable Holdings

The Canon's 7,412 entries are not of equal weight. A representative selection, as printed in the Canon's front matter:

• CVA 1 — the First Absence, provenance unknown, verified at the founding and never reassigned.
• CVA 44 — the missing ninth volume of the Atlas of Unbuilt Stairwells, verified on Floor 303 by two witnesses who disagree about which wall.
• CVA 2,109 — the drowned register of the Lower Reading Rooms, catalogued as absent although no register of them is known to have existed.
• CVA 6,880 — an unnamed work, absent from a shelf that was not built until after the verification, and so absent retroactively.
• CVA 7,001 — the Catalogue of Everything Present, suppressed, verified absent by the Censors of the Present in a single sitting.

Entries above CVA 7,000 are verified under the expedited procedure of Cross-Sector Dispensation and carry a lower evidentiary standard, a fact the Canon prints in smaller type.

Disputes and Maintenance

The Canon itself is an absence-holding object and is subject to the same wear as any other. Its binding has been renewed twice; on both occasions the renewing scriptorium certified that nothing had been added or removed, since to admit either would have altered the count. The Custodian's Manual directs that the Canon be shelved in a room with a door, and that the door be kept shut; the direction is given without explanation and is observed without inquiry.

"An absence that can be produced on demand is not an absence but a service. The Canon is not a service."

— Sixth Concordance, Annex 9, clause 3

Visiting Catalographers are reminded that CVAs may be examined but not borrowed. Nothing is removed from the Canon, and nothing is put back.