Property Extraction

Property Extraction is the authorized physical removal of an ontological fixture or material resource from its designated location within The Tower. Its procedures are distinct from, but often preparatory to, Source Extraction.

Regulatory Framework

The regulatory basis for Property Extraction is dispersed across the Concordances, which classify extraction by the nature of the material and its intended use. The process is governed by a complex framework of permits, quotas, and witness requirements. Key governing documents include the Third Concordance, which formalizes the system of temporal allowances for silicate extraction, and the Seventeenth Concordance, which implicitly governs the harvest of ambient phenomena through its protocols for Signal Harvest. The Foundation of Survey Protocols provides the procedural basis, with Clause 44(b) being the primary authority for extractions of materials like Lament Marble. All extractions must be documented using the appropriate form, most commonly Form 7-Δ, filed in triplicate with the Office of Material Appropriation.

Commonly Extracted Properties

The spectrum of extractable properties is vast, ranging from mundane architectural components to highly refined ontological substances. Standard classifications include:

Geological & Architectural: This includes silicate formations, such as the operational extractions at Quartz Desiderata, and structural elements like Void-Silver reinforcing beams or slabs of Sympathetic Stone.
Phenomenological: The capture of ephemeral conditions or environmental effects, such as the Silentium Gradient from Floor 1882 or the Vect Resonance Shift from Floor 333. These are often bottled or inscribed onto stabilized media.
Conceptual & Artifactual: The removal of objects of specific conceptual density, including classified artifacts like Nictitating Vellum (the exclusive purview of Sigma-class descent operations) or dormant substances like Sleeping Ink.

Procedural Requirements

Authorization for a Property Extraction is contingent on a sanctioned descent operation, such as the Vellum Descent Sigma-1. A minimum of three certified Librarian witnesses must observe and verify the extraction point, the methodology, and the subsequent sealing of the extraction site to prevent conceptual leakage. The principle of Catalogical Stability demands that the resulting void be filled with a certified ontological placeholder to maintain the structural integrity of the local catalogue. Failure to do so risks triggering a localized collapse of Narrative Inertia.

Risks and Contaminations

Improper or unsanctioned Property Extraction is a primary vector for Conceptual Contamination. The mechanical dislodging of a property can cause its latent ontological character to infuse the extraction tools, the personnel, or even the surrounding architecture, a process detailed in studies of Conceptual Infusion. Furthermore, the removal of certain resonant materials can destabilize adjacent catalogical entries, leading to palimpsest effects or transient phenomena. The Realist School maintains that this proves the intrinsic interconnectivity of all holdings, while administrative guidelines focus on containment protocols and decontamination washes for affected Reflective personnel.

Scholarly Disputes

A central ontological debate concerns the point at which Property Extraction becomes Source Extraction. The prevailing administrative view, as iterated in Annex Γ of the Third Concordance, holds that Property Extraction is merely the physical relocation of a catalogued item, while Source Extraction is the induction of a new subject into the Tower's holdings. However, dissenting scholars, often aligned with the Realist School, argue that the removal of a phenomenological property (e.g., a gradient or shift) from its native floor effectively creates a new, portable entity, thereby fulfilling the criteria for Source Extraction at the moment of its containment. This dispute has practical implications for taxonomies, form filing, and witness fee schedules, and remains unresolved by the Concordances.