Bureau of Silvanus Classification

Scope and standing

The Bureau of Silvanus Classification is a subordinate office of the Department of Arboreal Reckoning, charged with the assignment, revision, and — where invoked under the Seventh Concordance's provisional clauses — the revocation of Silvanus designations across the Tower's registered voids. It is seated on Floor 771-α, a landing of unusual width that the Bureau has held since the Winter Accord of 402 and from which it has never been displaced, though twice it has been asked to share.

The Bureau's remit is narrower than its name suggests and wider than the Department has ever admitted. It classifies; it does not survey. Surveying is the province of the Census Bureau, whose field clerks maintain that a void which cannot be counted cannot be classified either, and who have repeated this objection in writing eleven times since 388. The Bureau's countersignature appears on the registries maintained under Silvanus, and its seal — a ringed aperture within an aperture — is the mark by which a Silvanus designation is recognized as settled.

Origins

The Bureau was constituted by departmental order in the year of the Third Recension, three cycles after the initial recording of Silvanus voids and the same season in which the Department formallyized their classification. Its first director, Clerk-Principal Hedra Vell, held the post for forty-one years and is remembered principally for the Index of Rejected Appellations, a ledger of names proposed for Silvanus voids and refused, which runs to nine volumes and includes every name ever submitted by the Bureau of Apparent Duplication.

Vell's successor, Ordain Pell, disputed the Bureau's founding date for the whole of his tenure, arguing that the departmental order had been issued in the wrong cycle and that the Bureau's first fourteen months of work were therefore acts of an unchartered body. The Twelfth Annex to the Third Concordance settled the matter by ruling both readings correct and instructing the Bureau to keep two chronologies, which it does to this day.

The classification hierarchy

Silvanus voids are graded under a four-tier scheme — primary, secondary, vestigial, and pending — with each tier subdivided by the Bureau's own ordinal marks. The scheme is stable; the application of it is not. Under the Silvanus ruling of 449, no depth-three zone may be established within forty paces of a Silvanus void, a prohibition whose enforcement depends entirely on a classification being in force at the moment of establishment. Several hundred depth-three zones remain on the registers with their founding classifications marked contested, and the Bureau has declined to say how many of them were founded in error.

The most consequential reclassifications concern the great exemplars. The Silvanus voids of Spiral 792 were examined by Substantiation Officers of the Bureau of Implementable Abstraction, who argued unsuccessfully for their "false" designation; the Bureau's counter-memorandum, appended to the Fourth Concordance, runs to thirty-one pages and is cited far more often than it is read. The Silvanus Annex remains classified as the Tower's primary certified source of Proto-Silvanus Aggregates and of Void-Silver drawn from the condensation layers, a dual designation that the Bureau regards as a single classification and the Bureau of Metallic Anomalies regards as two.

The Feud of the Two Indexes

From 431 to 447 the Bureau maintained rival indexes of Silvanus designations under Directors Cassel and Wren, who disagreed over whether a void's classification should follow its measured extent or its botanical effects. Cassel's index was physical and ordered by extent; Wren's was nominal and ordered by the date of first recording. Both were correct. The impasse ended only when a junior clerk, Fenn Alder, noticed that the two indexes agreed on every entry except the Silvanus void of Floor 612-δ, which Cassel had classed as vestigial and Wren as pending, and which neither director had personally visited in over a decade. Alder's survey of the floor resolved the entry and, by a quiet clause of the Winter Concordance, made the physical index authoritative where the two conflict. Wren resigned the following spring.

Contested questions

Whether classification attaches to a void or to the record of a void remains the Bureau's standing unresolved question, and it has resisted every attempt to settle it. The Fourth Concordance implies the former; the Seventh Concordance implies the latter; the Second Concordance implies neither and is cited by both sides. In practice the Bureau treats the distinction as moot except during recension years, when a void may be recorded twice under two classifications, neither of which is withdrawn until an ordinal mark is affixed by hand to both entries.

A second dispute concerns the relationship between Silvanus classification and Root Shadow documentation, which is mandatory at a Silvanus locus. The Bureau holds that documenting a Root Shadow does not require the site to be classified, while the Department holds the opposite, and the two offices have filed a combined total of forty amendments to the relevant Concordance clause since 455, of which four have been ratified.

Visiting and maintenance

The Bureau's reading room is open on the eighth and ninth days of each cycle. Visitors are asked to leave chalk at the desk. Dusting of the indexes is performed on the first day of each cycle, during which the reading room is closed without further notice; the sealing of Floor 771-α for this purpose is the only occasion on which the Bureau's landing is closed to the Department above it.

Classification marks affixed by hand are not replaced by stamped marks except under Concordance authority, and the Bureau's archive accordingly retains both systems side by side. The last hand-affixed mark was applied in 468, by Fenn Alder, who by then held the title of Director.