Class-3 Oneiric Artefact

Class-3 Oneiric Artefact refers to a specific categorization of non-material phenomena within The Tower that possess a stable, dream-logic-based architecture but exhibit predictable, cyclical dormancy phases. Governed by the Oneiric Taxonomies, this class denotes artefacts whose reality-coefficient fluctuates between 0.55 and 0.78 on the Oneiroscone but does not fall below the critical threshold for archival dissolution.

Taxonomic Distinction

Class-3 is delineated from other Oneiric classifications by its behavioral signature. Unlike the volatile, self-amplifying nature of Oneiric Feedback or the static nature of Class-1: Inert Oneiric Residues, Class-3 artefacts maintain a coherent internal narrative or structural principle. Their defining trait is a periodic attenuation of measurable effect, documented as a "dormancy trough" in archival ledgers. As per Clause 44-Delta of the Third Concordance, a dormancy trough must last no less than 72 standard Tower hours and no more than 240 hours, during which the artefact's interaction with its catalogued environment diminishes by 94–99%.

The classification sits adjacent to, but is distinct from, the cataloguing of physical dream-matter such as Oneiric Ores. An artefact's class is determined not by its substance but by its behavioral profile, as recorded by a Oneiric Integrity Screening panel. The Oneiric Decimal System assigns sigils to Class-3 artefacts whose third digit is always a 3, 6, or 9, indicating the dormancy cycle's harmonic group.

Common Manifestations

Class-3 artefacts typically manifest in one of three documented forms:

• Recurrent Oneiric Constructs: Semi-stable dreamscapes, such as the perpetually-setting sun in the western gallery of Floor 11,211, which dims to a faint afterimage for precisely one hundred hours every eight days.
• Narrative Embers: Fragments of story or song that manifest audibly or as text, repeating with minor variations before falling silent for a documented interval. The "Lament of the Seventeenth Scribe," catalogued on Floor 7,403, is a prime example, ceasing its recitation for exactly 120 hours between cycles.
• Oneiric Instruments: Tools that function only within dream-logic parameters and become non-functional during dormancy. This includes devices like the Ambivalent Prism, which, while primarily an Ambivalent Artefact, exhibits Class-3 behavioral patterns in its refractive cycles, as noted in the addendum to Diagram Theta.

Governance and Handling

The handling of Class-3 Oneiric Artefacts falls under the jurisdiction of the Department of Ephemeral Holdings. Standard procedure, as outlined in Concordance 22, Annex Theta, requires that interaction, study, or extraction of spectral data may only be conducted during the artefact's "active phase." A minimum of two calibrated Oculi of Provisional Aspect must be trained on the artefact to monitor for premature dormancy onset or, conversely, dangerous intensification towards an Oneiric Resonance event.

Containment protocols are less stringent than for unstable classes, but archivists must account for the dormancy period in logistical planning. A common citation in procedural disputes is the Fixed Ladder Index entry for the Attenuation Lens, a Class often used to gently suppress a Class-3 artefact's peak intensity, thereby prolonging its active phase for study.

Scholarly Disputes

The primary academic controversy concerns the ontological status of the dormancy phase. The "Null Hypothesis" faction, led by the scholars of Floor 9,002, argues that the artefact ceases to exist as a discrete entity during troughs, and what is catalogued is merely a potentiality anchor. Conversely, the "Continuous Substrate" school, based primarily on Floor 4,556, contends that the artefact transitions to a state imperceptible to standard instruments but still materially present, citing faint traces of Oneiric Blue registration that persist even in deepest dormancy.

This dispute has practical ramifications. The Null Hypothesis informs the stricter interpretation of Spectrum Authentication, which treats reactivation as a new accession event, generating duplicate paperwork. The Continuous Substrate view allows for a single, continuous catalog entry, a position tacitly supported by the logistical preferences of the Librarians but never officially enshrined in a Concordance, leading to perennial bureaucratic friction.

Notable Examples

The Migrating Map of Floor 5,671 ("Cartographer's Sigh")

A topographical chart that accurately depicts the layout of whichever floor it is currently on, but which folds itself into the shape of a sleeping songbird for 96-hour periods. Its sigil is 6.3.9.1.

The Thirteenth Brass Key

While its primary classification is debated, it displays a Class-3 dormancy cycle, during which it will not fit any lock in The Tower, not even the one it previously opened. Its active phase is irregular but predictable via oneiric calculus.

The Whispering Aquifer

Documented in the Atlas of Oneiric Water Tables, this subterranean flow on Floor 22,009 carries coherent, prophetic whispers. The water turns silent and visually opaque for 144-hour cycles, during which it is indistinguishable from normal water, posing a contamination risk to the Tower's hydrological systems.