Event at Floor 1117

The Event at Floor 1117, also recorded as the Floor 1117 Reversal Event, was a spatial dislocation of severe grade occurring on Floor 1117 over the night of 3–4 Harrowing, by the reckoning of the northern scriptorium. In the space of approximately nine hours the floor's eastern annex rotated upon an axis that no subsequent survey has located, so that holdings shelved against the north wall were recovered against the south, corridors terminated in doorways that opened into the rooms they had left, and four readers of the day shift arrived at their desks to find them occupied by their own correspondence of the previous week. The event was graded Severe under the Schedule of Spatial Dislocations and remains the standing example of that grade in the instruction of junior surveyors.

No injury was recorded. This is frequently remarked upon in the literature, and just as frequently attributed to the fact that the readers involved had all stepped out for the mid-night bell.

The nine hours

The first notice was filed at the fourth hour by the duty clerk, Oris Vantle, who reported that the corridor outside the survey office had acquired a bend where the floor plan admitted none. Vantle's log, preserved in the annexe to Custodial Directive 743-A, records the sequence with characteristic brevity:

"The bend persists. I have walked it twice. On the second walk it was the other way. I have not walked it a third time."

— Duty log of Floor 1117, folio 12, Registry of Annexed Floors

By the seventh hour the reversal had propagated to the western stacks, where mineral holdings were reported to be shelving themselves in reverse accession order without the intervention of any hand. The Bureau of Resonance Oversight was notified and declined to dispatch a full team, having classified the disturbance as a spatial matter and therefore outside its remit; this determination would be revisited, unfavourably, in the inquiry that followed. A single observer, Surveyor Pell of the Third Recension, attended and spent the remainder of the night measuring a room that she later testified she had measured only once.

The re-survey

Re-survey of Floor 1117 and the eleven sectors adjacent to it commenced on 9 Harrowing and concluded, in its first phase, on 2 Sorrow. The surveyors issued forty-one Notices of Spatial Anomaly, of which thirty-six were subsequently withdrawn as duplicates of one another — the consequence, it was agreed, of the surveyors having traversed the same corridor in both directions without noticing.

The re-survey established three findings that have held against all later challenge. First, that the floor's gross area was unaltered. Second, that the internal arrangement of that area was not. Third, and most inconveniently for the Registry, that the numbering of the eastern annex's bays now ran in an order that matched neither the pre-event plan nor any recension of it on file. The bays were accordingly renumbered, and then renumbered again after the second phase, and the numbering in use today is acknowledged in the Registry's own preface to be "provisional, and likely to remain so" (Registry of Annexed Floors, preface to the 1117 fascicle).

Dispute of attribution

The scholarly disagreement concerning Floor 1117 is not over what occurred but over what it should be called, and by whom.

Concordance 220, as amended by the Annex on Unstable Rooms, classifies the event as a reversal — a rotation of holdings about a fixed centre, with the centre itself exempt. The Bureau of Resonance Oversight, in its marginalia to the same document, insists upon displacement, on the grounds that no centre was ever located and that a reversal without a centre is a contradiction in terms. The Guild of Theoretical Mechanics, asked for an opinion, returned a memorandum declining to distinguish the two, which memorandum has since been cited in support of both positions.

Librarian Ostrec the Younger, in his Notes Toward a General Theory of Returning, proposes a third term — recursion — and observes that the eastern annex did not so much turn as insist upon itself. His view has found little support and considerable quotation.

"A room may be turned. A room may also decline to be anywhere else. The second is the harder case and the one we have."

— Librarian Ostrec the Younger, Notes Toward a General Theory of Returning, folio 9

Consequences for procedure

The event produced two procedural legacies. The first is the standing requirement, set out in the Annex on Unstable Rooms, that no floor undergoing re-survey be renumbered until the surveyors have been recalled and confirmed to have left. The second is the practice of marking bays on reversible floors with chalk rather than ink, a rule introduced after the second renumbering and maintained despite the scarcity of chalk, which is drawn from stores on Floor 412 and which the Registry has twice petitioned to have increased.

The event is also cited, though not without controversy, in the preamble to the amendments of Ordinance of Provisional Containment 12-G, which the drafters justified by reference to "the lesson of the eleventh-hundred floors, where the map followed the territory and both were wrong" (Ordinance 12-G, preamble, second recension). Readers will note that the same preamble invokes the Resonance Event on Floor 1001, an event of acknowledged minor grade; the pairing is regarded in some quarters as an overstatement and in others as the only honest thing in the document.

Present condition

Floor 1117 remains in service. Its corridors are walked daily, its bays are numbered provisionally, and its eastern annex is inspected each Harrowing on the anniversary of the event, at the fourth hour, by a clerk who is required to walk the corridor twice and to record whether the bend has changed its mind. The present clerk has held the duty since 12 years past and has never missed a year.

Visitors are reminded that the annex's north door is not to be opened while the survey lamp is lit.