Interstitial Landing

Interstitial Landings are the quasi-functional platforms that exist at the theoretical midpoint between two formally numbered Landings of the Tower, arising from unresolved architectural tensions or the accretion of procedural amendments. They are not recognized by the primary floor indices but are acknowledged for specific administrative and juridical purposes.

Definition and Status

An Interstitial Landing is formally defined in Clause 17(b) of DoIT-184 ("Directive on Interstitial Taxonomies") as "any contiguous planar surface of sufficient breadth to support a standing convocation, situated between two ratified Landings, whose existence is recorded in a ratified Interstitial Sheaf." Their legal status is ambivalent; they are considered part of the Tower's fabric for maintenance liability (per Annex VII of the Third Concordance) yet are cartographic nullities for navigational purposes. The Atlas of Interstitial Logic catalogs over 1,200 ratified instances, though scholars like Lira of the Forty-Seventh Landing argue the true number is incalculable due to recursive definitional flaws.

Genesis and Recognition

Interstitial Landings do not arise from design, but from consensus. The most common genesis is the discovery of a "persistent void" during structural surveys, often following amendments to load-bearing regulations. For example, the reforms to the structural compliance regime on the Fourteenth Landing in Epoch 212-A revealed a previously unregistered chamber measuring 4.3 x 5.1 x 2.8 meters between the Fourteenth and Fifteenth Landings. The process for recognition is governed by the Protocol for Interstitial Grievance Arbitration (7th Revision), which requires the convening of an Interstitial Plenum to adjudicate the claim. A successful ratification results in the creation of an Interstitial Sheaf, which is then transferred to the permanent pages of the Atlas.

These landings are typically marked in Oneiric Blue, as seen at Aperture Gamma. Their physical attributes are highly variable: some are stable marble expanses, while others, like the one adjacent to the Damp Stairwell, exhibit a perceptible dampness and a faint, perpetual dusk.

Functional Purposes

Despite their nebulous status, Interstitial Landings serve several codified functions:

• Grievance Arbitration: They are the mandated locale for Interstitial Plenums, as their "jurisdictionally ambiguous" nature is deemed appropriate for adjudicating boundary disputes.
• Provisional Workspace: Verification ateliers operating under temporal permits, such as the 22.J Landing Atelier, often use adjoining Interstitial Landings for overflow cataloguing or volatile specimen isolation.
• Architectural Buffer: Annex Γ of DoIT-184 designates them as permissible zones for the installation of Interstitial Girders, which are used to stabilize "conceptually laden" sections of wall without altering the official floorplan.

Notable Examples and Controversies

The most cited example is the landing upon which the Miletus Fragment was temporarily stored by Alban of the Thirty-Sixth Landing prior to its contentious cataloguing on the Fourteenth Landing. This instance precipitated the "Sheaf vs. Shelving" debate, questioning whether an object's temporary placement on an Interstitial Landing confers any ontological priority.

A persistent scholarly controversy, led by the School of Procedural Purists, argues that the very act of naming an Interstitial Landing (e.g., "the landing of the Western Helical Staircase") contradicts its interstitial nature, effectively pulling it into the taxonomic schema it is meant to exist outside of. Proponents counter that operational necessity requires provisional designations, a principle upheld in the minutes of the Plenum for Spire 44.

Relation to Other Interstitial Phenomena

Interstitial Landings are a subset of the broader category of Interstitial Spaces, which includes ducts, epistemological gaps, and sanctioned silence. They are distinct in their requirement to support "a standing convocation," a criterion that excludes narrower voids. Their governance is uniquely tied to the plenary system, whereas other Interstitial Spaces may be governed by guild charters or, in rare cases, the Charter of Conferred Being. The Western Atmospheric Spiral is noted for a disproportional density of ratified Interstitial Landings, attributed to the spiral's "atmospheric reluctance" to conform to standard floorplate geometry.