Proximity to the fracture-boundary alters sensory gradients. No clear perimeter—only a slow tilt of internal vectors. Subjects report a density shift in their own marrow, followed by refractive stammering in peripheral fields.
No mechanical instrumentation has survived past Δ-skein ingress; only organic proxies maintain coherent feedback. The preferred method remains ungloved skin contact across saturated boundary layers.
Δ-skein vibration: audible within calcium architecture of the skull. Lowest perceived threshold coincides with marrow rephasing at unrecorded oscillatory drift.
Shadow-fray rate: detectable only by triple-salt water displacement under absence of coherent thought.
Glyph-vein latency: self-erasing under conscious gaze, stable during breath suspension (average of 4.3 suspensions required per observation burst).
Unspoken alignments: unnoticed coordination of finger joints among separate witnesses during glyph-seep readings.
Vestibule Drift: slow gradient pull toward breach center, operating even against navigational intention. Micro-displacements charted across anchor glyphs.
Whisper Salt: accumulation along tear-lines in garments, later revealed under polarized vibration fields.
Residual objects periodically surface along fracture perimeters. Artifacts exhibit non-Newtonian anchoring, resisting conventional displacement. Initial taxonomy divided items into 'veil-thin' (perceptual artifacts) and 'grave-heavy' (gravitational anomalies).
Notable specimen: 'Glassbone Mirror' — a reflective surface that phase-inverts retinal mapping. Prolonged exposure risks internal recursion loops.
Chronometric readings near deep-breach sites consistently fracture into probabilistic waveforms. Local time vectors experience 'foaming' — subjectively perceived as seconds folding inward and reemerging elongated.
Operational limits: Direct witness exposure exceeding 43 seconds results in semantic drift and catastrophic memory-loop entanglement.