I recently began a series of experiments with the sensory deprivation tank as developed by John C. Lilly, M.D., a device that most have heard of but few have tried. (Yes, that’s the one from the 1980 movie Altered States.) It took me a decade and a half of self-directed experimentation on consciousness to finally get around to using one. Luckily, when I was ready, I found that there was a facility five minutes from my workplace. I booked the time. I got in.
The sensory deprivation tank is exactly that — a large, soundproof, lightproof tank filled with shallow, warm, buoyant water, all designed to completely shut off all sensory input.
The tank itself is heated to exactly 93.0º, a temperature that feels warm without being intrusive, so that your body quickly tunes it out. The water — just shallow enough to lie in — is saturated with Epsom…
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