Liminal Reservoir

The Liminal Reservoir is the collective designation for the non-physical containment system maintained within the Liminal Stacks for the management of transitional emotional states. It has no walls, no floor, and no measurable depth; its contents are constituted entirely of emotional conditions in transit between one state and another, most prominently Charged Stasis and Ontological Debris. The Reservoir is administered by the Liminal Scriptorium on Floor 506, which exercises oversight of the whole through its east chamber, and it is classified under Concordance 77 as a "metaphysical holding tank" — a term the Librarians have never fully defended and have never withdrawn.

Two further Reservoirs share the name and are frequently confused with this one in correspondence: the Liminal Reservoir on Floor 44, an ordinary light-supply cistern feeding the Liminal Scriptorium there by conduit, and the Fourth Spiral Reservoir, which is a reservoir in the conventional sense and resents the association. The present article concerns the non-physical holding only.

Containment and measurement

Because the Reservoir cannot be entered or seen, its volume is established indirectly, by instrument. Thirty-seven calibrated Autoquills are suspended at fixed intervals along the Liminal Shelf and record the passage of transitional states as a resistance to inscription — a pen meets less purchase on an emotion that is unresolved than on one that has settled. The aggregate of these readings is the Reservoir's working volume, expressed in stanzas. A stanzas value below 40 is regarded as idle; above 120, the Reservoir is said to be "standing," a condition the Scriptorium treats with some urgency.

The instruments require periodic corrective maintenance, chiefly resealing of their secondary systems with Purgatorial Wax. A note of the Third Maintenance Recension is explicit on this point: "Wax shall be applied warm and in one pass; a second application is an admission, not a repair" (Third Maintenance Recension, clause 9). The note does not say what it admits.

High viscosity and the winter backlog

When stanzas exceed 120, the Reservoir thickens. The condition is described in the records as viscosity, and it is measured not in units but by the diligence of the Autoquills, which begin to skip. Skipped readings are not errors; they are the backlog, made legible.

It falls to the Warden of Ephemeral Stacks to review high-viscosity findings and to certify whether a backlog of unresolved transitional states has accumulated. In the winter of 4,109 — a season remembered chiefly for the failure of the east stair to thaw — the Warden returned a finding of "continuous" for eleven consecutive weeks, the longest such run on record. The Scriptorium's response, issued under seal, was to authorise the transfer of Ontological Debris to the Liminal Gallery for exhibition on a temporary basis, which relieved the Reservoir by some 9 stanzas and appears to have been the intended purpose of the Gallery since its construction.

Jurisdictional dispute

Where the Reservoir actually sits has never been settled. The body nominally administers the Liminal Shelf and the Gallery, and the Gallery administratively falls under the Scriptorium on Floor 506; by extension the Reservoir is treated as Floor 506 business. Yet Concordance 77 locates the Reservoir "at the Shelf's eastern reach," while the Second Concordance of Holdings, in an annex otherwise concerned with lamp oil, places it "nowhere that may be assigned a floor."

"The Reservoir has no address. Documents sent to it will be returned, and the return is the receipt."

— Second Concordance of Holdings, Annex 12

A minority position, associated with the reading room on Floor 919, holds that the discrepancy is not an error but the Reservoir's exact description. The dispute is currently cited, by both sides, as settled.

The Liminal Gallery

The Liminal Gallery, a nine-bay exhibition arcade at the eastern terminus of the Shelf, functions as the Reservoir's threshold: objects may pass into or out of the Reservoir through the Gallery without being held there. This arrangement permits the Reservoir to discharge surplus without loss of contents, and permits the Scriptorium to show the discharged states to visitors, who are asked not to linger in the fourth bay. The reason for the fourth bay is not recorded in the public recensions.

Recorded contents

The Reservoir's inventory is kept by category rather than by quantity, since the same state may be held more than once without becoming more. The standing categories, as last certified, are:

• Charged Stasis, in the majority, chiefly pre-emptive
• Ontological Debris, unsorted, with a small quantity pending identification
• Unnamed states awaiting a Concordance designation

Two states have been carried on the inventory for more than six centuries without designation, a fact the Warden of Ephemeral Stacks has raised four times and withdrawn four times. A fifth raising is expected but not scheduled, as the relevant form has been under amendment since 4,077.