The Deep Self: Consciousness Exploration in the Isolation Tank
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In 1954 Dr. John C. Lilly invented the isolation tank method for research into the Deep Self. This book summarizes the conclusions, methods, means, and results of 25 years of intrepid research beyond the "forbidden frontiers" of the human mind.
It reprints personal testimonies of many who tried it including Richard Feynman, E.J. Gold, Stanislav Grof, Burgess Meredith, Andrew Weil, Robert Anton Wilson, and others.