Juxtaposition

Juxtaposition is the administrative art of placing two or more holdings beside one another so that each may be more fully described by the company it keeps. It is among the oldest duties of the Librarians and the most frequently litigated. A juxtaposition, properly executed, is not an arrangement of convenience but a finding: the Tower holds that adjacency produces information that neither entry contains alone. Improper adjacency produces the same information, only incorrectly, which is why the practice is governed by no fewer than nine Concordances and is prohibited in the stairwells entirely.

Doctrine and the Tags

Every catalogued holding carries categorical tags, assigned at accession by the Clerks of the Fixed Page and revised only by petition. Juxtaposition proceeds by matching tags. The governing principle is that of Principle of Sympathetic Juxtaposition, which holds that fragments sharing a minimum of two categorical tags will, over a determinable period, exchange latent thematic elements. The period is determined by the Presiding Tag-Mistress and is not published, on the grounds that publication would influence it.

The mechanics of conflicting entries fall under Clause 3 Comparative Juxtaposition, a provision of the Twelfth Concordance governing the arrangement of suspect or conflicting entries prior to formal evaluation. The clause was copied from the Third Concordance, Clause 3, in 4th-cycle 12, and has been amended eleven times since without any corresponding revision to the original, so that the two now require different things of the same shelf. The subsequent 227th Amendment to the Twelfth Concordance defines Comparative Synthesis as the "systematic juxtaposition and evaluation of contradictory spatial data to establish a provisional hierarchy of veracity," thereby formalising what had for two centuries been done by argument.

The Rule Against Ascent

Juxtaposition across a means of ascent is forbidden. Clause 812 was issued after an incident involving Anselm Vey, who carried an unpaired folio from Floor 451 to Floor 450.5 by stair and set it against a folio already shelved there; the two entries reconciled overnight and thereafter described a floor that does not exist, in some detail, for eleven days. Vey was reassigned to the inventory of the eastern stairwell and has not been consulted since. The clause is read strictly: a holding may not be juxtaposed with another holding on a different landing, and a folio found on a stair is to be returned to the nearer landing without being read.

Coincidence and the MR-7

Juxtaposition performed deliberately is a procedure. Juxtaposition occurring of itself is a filing event, and the distinction is jurisdictional. Where two holdings are found incidentally adjacent — on a trolley, in a reading room, in the sleeve of a third holding — the MR-7 form, titled "Notice of Coincidental Juxtaposition," must be filed within the same cycle. The form requires the filer to state which holding arrived second. Filers who cannot establish the order of arrival must file two forms, each naming the other as first, and the pair is then evaluated under Clause 3 Comparative Juxtaposition like any other conflict.

In the winter of 3rd-cycle 88 the Seventh Reading Room filed four hundred and six such paired notices in a single month, all concerning the same two pamphlets, which a cleaner had been setting side by side each night without record. The pamphlets were separated, sealed, and returned to their shelves; the cleaner was commended.

Erasure and the Limits of the Practice

Juxtaposition is not permitted where one of the holdings is subject to Erasure. An erased entry placed beside an intact one will draw its remaining content into the erased space, a phenomenon recorded by the Geometers of Meaning as "the silent neighbour." The Alexandrian Interpreters dispute this, maintaining in their commentary on the Twelfth that the drawn content is not lost but transferred to the erased entry, from which it may be recovered by interlineation. The Clerks of the Fixed Page reject the reading on the grounds that no one has recovered any.

Related difficulties arise near the Echobeings, whose entries tend to duplicate their neighbours' tags. A shelf containing one Echobeing is treated, for juxtaposition purposes, as a shelf containing three.

The Twin Catalogs and the Standing Dispute

The Dispute of the Twin Catalogs is the longest-running controversy in the practice. The catalogs of Floor 450 and Floor 451 hold that juxtaposition is a descriptive act: adjacency reveals the true relationship already latent between holdings. The catalog of Floor 450.5, drafted in the interval by clerks who had access to both, holds that juxtaposition is constitutive: the relationship exists only once arranged, and ceases when the holdings are separated. Neither side will concede, and both cite Concordant Law in identical phrasing.

"Where two entries are set together the archive learns something it did not know; it does not learn what it would have known had it not set them together."

— Twelfth Concordance, Annex 4, note of the Presiding Tag-Mistress

The note is cited by both parties. A resolution was attempted in 4th-cycle 19 by Interlinearation of the disputed passages, producing a text that both catalogs accept and neither will read.

Practical Notes

Juxtaposition is conducted at tables of not less than one and a half spans in width, and the tables are not to be moved. Holdings under active comparison are covered at the close of the reading day with a green cloth; holdings under appeal receive a red cloth; the supply of red cloth is limited, and clerks are reminded that only one appeal per table may be open at a time. The Warden of Perilous Folios attends any juxtaposition involving a holding above the fourth peril class, and must be given the aisle seat.