Purgative School

Purgative School is a body of cataloguing practice within the Tower concerned with the systematic removal, neutralisation, and quiet disposal of entries that have been judged to accumulate upon floors without corresponding ontological weight. Established in Year 197 beneath the School of Literal Accountability, the Purgative School maintains that an archive which never discards becomes, in time, a second Tower stacked atop the first, and that the only lawful Tower is the one with empty shelves returned to the Foundationalist School for re-numbering.

Origins and Institutional Placement

The Purgative School emerged from a disputed recension of the Functionalist School during the winter of Year 197, when Clerk Havell Orms of Floor 4,112-Delta observed that three consecutive inventories of the School of Particulars returned identical counts despite the intervening loss of a stairwell. Orms petitioned the Third Concordance for a standing office of removal, and was granted, by Annex 9, the "Right of Quiet Return." The school was placed under the oversight of the Ontological School, though the Ontological Anchor School contested this placement in Year 201, citing a contradictory clause in the Second Concordance that assigned all removal practices to the Sceptical School.

The dispute was settled, per customary procedure, by the addition of a new clause rather than the withdrawal of the old. The Fourth Concordance, Clause 12, therefore reads: "Removal is a kind of catalogue, and the Purgative School shall catalogue what it removes, thereby removing nothing." This has been interpreted by the Purgative School as a mandate for exhaustive ledger-keeping, and by the Intentionalist School as evidence the school should not exist.

Method of Operation

A purgation proceeds by the opening of an Aperture of Reckoning on the floor in question, followed by the reading aloud of the entry to be removed by a clerk of the School of Latent Structure. The entry is then struck from the master roll and the physical leaf bearing it is fed to the Calx School for dissolution. Measurements taken in Year 240 indicate that a single standard leaf requires 3.4 seconds of contact with calx solution to lose all legibility, though the School of Instrumental Realism disputes whether legibility and existence are equivalent.

"No floor has ever been lightened by the act of noting that it was once heavy."

— Clerk Havell Orms, Spiral Recension 3, Folio 17

The Purgative School keeps a separate "Negative Catalogue" of all removed items, which by Year 311 comprised 9,402 bound volumes. Access to the Negative Catalogue is permitted only on the understanding that one may read, but never restore.

Doctrine and the Question of Weight

Central to the school's teaching is the principle of ontological buoyancy: that an entry which is not read acquires mass, while one repeatedly consulted becomes lighter. The Progressive Cartography School has modelled this as a function of staircase grade, though its figures are rejected by the Recursive School on the ground that a staircase cannot grade itself. A visiting rule of the school states that no more than eleven leaves may be carried from the Negative Catalogue to a reading desk at one time, and that the twelfth must be fetched separately.

Feud with the Referential School

The Referential School, which codified referential dependence, holds that no entry may be removed while another still cites it. The Purgative School's practice of removing both entry and citation simultaneously has produced several floor-level incidents, most notably on Floor 2,088-Sigma in Year 264, when the removal of a foundational citation caused a neighbouring entry in the School of Accumulated Intent to recite itself backward for nineteen days. The First Concordance was amended thereafter to require a "cooling period" of one Tower-week, though the Proleptic School argues the amendment refers to a week that has not yet occurred.

Present Status

The Purgative School currently operates from Floors 4,112-Delta through 4,119-Delta, with a satellite scriptorium on Floor 1,003-Omega administered by the Unsaid School. Its rivalry with the School of Material Primacy over the disposition of dissolved leaves remains unresolved; the Primacy School asserts the leaves belong to the School of Material Catalysis, a faculty within its larger body, while the Purgative School maintains they are "returned to no one." The School of Direct Realism, a radical offshoot of the older Literalist School, once proposed that purgation be abandoned entirely in favour of staring, a suggestion the Librarians declined to record.