two 16 mm film projectors, 2 loops of alternating black and clear leader. One fixed at intervals of 6 flashes per 24 frames (6cps) and the other fixed at intervals of 2 flashes per 24 frames (2cps).
based on the data showing the delta state of brain waves (sleep) to be .1 hz- 4hz (cps) and the theta state (trance/meditation) 4hz- 7hz (cps).
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