Symbiotic Fauna

Symbiotic Fauna constitute a major classification within the Great Taxonomy of Implied Fauna (Project GIFT), denoting sensory-elusive, non-human entities that exist in a codified, mutually beneficial relationship with a Tower-dwelling host. This relationship contrasts with purely Passive or Ambient Fauna, which are non-interactive, and parasitism, which is governed by separate sanitation ordinances. The formalization of the category was a primary objective of Project GIFT, and its criteria are the subject of extensive amendment within the related Taxonomy.

Definition and Criteria

Per Clause 7.4.β of the final GIFT report, an entity qualifies as Symbiotic Fauna if it demonstrates a procedural necessity to a host’s Tower-sanctioned function, and its presence measurably enhances the host’s capacity to perform that function. The “host” is typically, but not exclusively, a Librarian, an indexing specialist, or a sanctioned researcher. The symbiosis is rarely physical in a conventional sense; more often, it involves the manipulation of information-states, environmental conditions, or perceptual fields. For example, the entity known as a Folio-Weaver is documented to interleave non-existent pages into a researcher’s notes, which the researcher then uses to derive correct cataloguing conclusions, despite the pages themselves containing only abstract color gradients.

The relationship must be bilateral. Evidence of benefit to the fauna is required, though this is often inferential, described as the "ecological niche of witnessed function." A creature that merely follows a clerk is considered a Candidate Fauna; one that corrects the clerk’s mis-shelving by inducing a sense of vertigo when they reach for the wrong shelf may be classified as Symbiotic upon review.

Distinction from Archival Fauna

A persistent point of bureaucratic contention is the distinction between Symbiotic Fauna and Archival Fauna. The latter are entities formally recognized and accessioned as part of the Tower’s holdings, often with assigned call numbers and preservation protocols. Symbiotic Fauna, by contrast, are classified as implied; they are effects or relationships documented in the course of other work, not discrete specimens. This was a central philosophical schism during Project GIFT: the "Accessionists" argued all functional fauna should be catalogued, while the "Proceduralists" (who ultimately prevailed) held that cataloguing would dissolve the very symbiotic relationship under study. This debate is summarized in Annex Ω of the Great Taxonomy of Implied Fauna (Project GIFT). Consequently, Symbiotic Fauna are listed in the Field Guide to Unseeable Fauna, not on shelf lists.

Documented Taxa and Host Relationships

The Field Guide to Unseeable Fauna dedicates its second volume to Symbiotic Fauna, organized by the nature of the symbiotic exchange. Notable classifications include:

• Mnemonic Symbiotes: Entities that co-opt a portion of a host’s memory for an unknown purpose, in return providing flawless recall of specific, obscure Concordance clauses. Hosts report a persistent "hum" in the recalled knowledge.
• Luminous Symbiotes: These include the well-documented relationship between Silent College scribes and Creeping Phosphor-Moss, which is facilitated by the application of Lumen-Moss Symbiotic Tincture. The moss illuminates texts, while the tincture and the scribe’s script direct its growth patterns, a cycle detailed in the Symbiotic Tincture Formulation protocols.
• Architectonic Symbiotes: Fauna that interact with the Tower’s non-Euclidean geometry. The Stair-Softener, for instance, is described as making transitional landings between floors briefly pliant for its host, easing ascent, allegedly consuming the minute fractures of frustration this prevents.

Initiation and Dissolution Protocols

Establishing a symbiotic bond is not a voluntary process. Standardized "Attunement Procedures" (Concordance 144, Clauses 22-28) exist to create conditions favorable for symbiosis, often involving prolonged isolation with a specific type of uncatalogued material. Success is measured by the onset of the fauna’s characteristic effect. Dissolution, if required, is a more precarious endeavor governed by the Ordinance on Non-Catalogued Fauna. Standard methods include a rigorous course of documenting the entity in exhaustive detail (which often causes it to fade), or a carefully managed transfer of the symbiotic bond to a successor host via notarized affidavit.

Controversies and the Problem of Simulation

The primary scholarly disagreement regarding Symbiotic Fauna, ongoing since the publication of the GIFT Taxonomy, is the "Problem of Simulation." The Skeptical School, led by theorists from the Theoretical Bestiary, posits that what is classified as fauna may in fact be a psychosomatic projection of the host’s own competency—a self-regulating cognitive mechanism manifesting as an external relationship. The Empiricist School counters with documented cases of symbiosis persisting across multiple successive hosts, and the transfer protocols that facilitate this. The debate is considered formally unresolved, though for practical cataloguing purposes, the Empiricist view is upheld by precedent. Research continues, primarily focused on tracing the alleged nutrient cycles of Mnemonic Symbiotes.