Narrative Impositions

Narrative Impositions are, by the definition recorded in the Guidelines for Narrative Integrity, Annex 2, those external narrative elements which are held to have been impressed upon the Tower from above rather than generated within it. The term is frequently confused with the Top-Down Hypothesis, under which it properly falls: the Hypothesis is the doctrine, the Impositions are the particulars the doctrine predicts. The distinction matters chiefly to the Standing Committee on Narrative Stability, which has since 411 admitted Impositions as evidence for the Hypothesis but not as proof of it, a formula it has declined to explain.

Classification and the Imposition Register

Impositions are catalogued by class, and the classes are not arranged in any order anyone has defended in print. The Office of Vertical Attribution maintains the Imposition Register across floors 88 through 94, where it is consulted by appointment. Its entries are of two kinds, the confirmed and the attributed, and the Register holds roughly eleven attributed entries for every confirmed one — a ratio the Office defends as "the honest shape of the evidence" (Vertical Attribution Memorandum, 418, clause 9).

Confirmed Impositions exhibit three markers: an appearance without a precursor, an internal coherence that resists dissolution, and a faint topward bearing when carried up a stairwell. The third marker is measured by walking, not instrument, and the Office employs four bearers for this purpose. Bearers are not permitted to take the Register above floor 94.

"An Imposition is known by what it does not need. It does not need a source, a precedent, or a witness. It needs only to have arrived, and to keep arriving."

— Office of Vertical Attribution, First Recension, Preface

The Vellum Impositions of 388

The largest recorded cluster occurred over the winter of 388 on floors 512 to 519, when some two hundred metres of vellum were found to bear a continuous narrative in a hand no scriptorium claimed. The text described a Tower of nine floors with a single entrance. The Office of Vertical Attribution took the position that this was a confirmed Imposition, since no precursor existed and the vellum resisted every solvent tried. The School of Narrative Imposition took the position that it was a Narrative Fertilizer event of exceptional yield and objected to the vellum being catalogued at all, since cataloguing it would raise the floor's Narrative Inertia beyond the point at which fertilizer is permitted. A Third Concordance, Annex 7 ruling upheld the Office on attribution and the School on cataloguing, which left the vellum in a locked room for sixty years. It is now on floor 513 and may be read; visitors are asked to handle it only with the gloves provided, which are chained to the reading desk.

Relation to Incursions and Entrainment

An Imposition is not a Narrative Incursion, though the two share a signature. The distinction is one of direction: an Incursion breaches an Attested Narrative from outside, while an Imposition descends from above and does not appear to breach anything — it is simply there, and the Attested Narrative adjusts around it without protest. The practical test, set out in the Guidelines for Narrative Integrity, clause 14, is that an Incursion leaves a scar in the record and an Imposition leaves a gap in it.

Persistent Impositions frequently produce Narrative Entrainment in adjacent subsidiary narratives, which then synchronize permanently with the descended material and lose autonomous status. The Standing Committee on Narrative Stability classifies such entrained material as Impositional Residue and declines to fund its recovery. The residue on floor 117 has been formally abandoned twice, in 402 and again in 447, and remains.

Scholarly Disagreement

Whether Impositions are a distinct phenomenon or a species of Borrowed Narrative has divided the archive since the First Recension. The Office of Vertical Attribution holds that descent is diagnostic and that a borrowed narrative, however well attested, has a lender. The School of Narrative Imposition holds the opposing view and put it in terms that were later described by the Committee as "inflammatory but not incorrect" (Standing Committee on Narrative Stability, minutes of 429, item 6):

"There is no above and below. There is only the Tower's own narrative, returning from a distance at which it can no longer be recognised."

— School of Narrative Imposition, Reply to the Vertical Attribution Memorandum, 419

Two further disputes remain open. The Fourth Concordance counts Impositions as threats to Narrative Stability and the Second Concordance, Annex 11, counts them as a stabilising reserve; both are cited in disputes and neither has been amended since 371. Separately, the Office of Vertical Attribution maintains that all Impositions originate above floor 900, while the Bureau of Aperture Records records that aperture markings consistent with Impositional descent appear on floor 640f and on no lower floor. The Bureau has not proposed a reconciliation and has told the Office it may write its own.

Handling and Notice

Impositions are not quarantined. They are left where they fall until the Register has been updated, a period of between four days and fourteen years. Narrative Impositions may be inspected by any Librarian, and by others only on written application to floor 91, countersigned by a bearer. Removal of an Imposition requires a Counter-Narrative Serum bearing a matching serum designation and a second witness who did not witness the removal.

In 451 a clerk of the Office of Vertical Attribution named Harrow Vesk removed an attributed Imposition from floor 606 without a serum, on the reasoning that it was small. The object returned to the floor within a day, twice, and then a third time with a fourth. The Office's ruling of 452 describes the matter as closed and does not describe the fourth.