CLASSIFIED BRIEFING DOCUMENT L7LTYH-ECHO-9. Eyes only. Incident "Glintzen" occurred on 02/30/1955, involving a non-Euclidean staircase in sector 4-Kappa. Witnesses reported "fugue-state" ascents, traversing 374 steps without vertical displacement. Anomalous luminescence, dubbed "l7ltyh glow," permeated the structure, inducing cryptomnesia in 87% of observers. Investigating teams discovered cryptic glyphs etched into the staircase's underside, pulsing with a faint, iridescent luminosity. All attempts to replicate or understand the phenomenon have been met with inexplicable, catastrophic equipment failure. Recommendation: seal and abandon sector 4-Kappa to prevent further destabilization of local reality matrices.