To find out what would happen if the brain was cut off from all external stimuli, scientist John Lilly built the first sensory deprivation tank in 1954. Floating in warm water for hours in complete darkness and silence, Lilly began to experience vivid fantasies.
"These are too personal to relate publicly," he reported later. The hallucinations of his test subjects were similarly difficult to categorize scientifically. This was one reason why his research did not take off.
Lilly later gave up scientific research and founded the firm Samadhi Tanks, which manufactured tanks for domestic use. Having became something of a New Age guru, he died in 2001.
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