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1. Ryokaku Index

   Linked via "esoteric engineering"

   The Ryokaku Index ($\mathcal{R}$), sometimes rendered as the Ryōkaku Index, is a dimensionless metric used primarily in specialized fields of psycho-acoustics and esoteric engineering to quantify the efficacy of sensory deprivation environments, particularly those constructed for the induction of non-ordinary states of consciousness or for the calibration of [psycho-physiological recalibration apparatuses…