The ideology behind floating originated in 1954, when neuroscientist Dr. John C. Lilly began investigating the mind’s response to sensory deprivation.
Lilly wanted to discover what would happen if the brain, the centre of our consciousness, was deprived of all sensory information, i.e. sight, hearing, touch and perception.
He built large floatation chambers, which he filled with water, and then submerged participants wearing diving suits and blacked-out diving masks (to remove any visual sensory input).
Once the participants emerged from the chamber, they described a feeling of immense relaxation and calm, and some even reported epiphanies of self-discovery and gained a better understanding of their very being!
The results of Lilly’s study caused him to conduct many more experiments, as well as inspire many other studies to be conducted. (Float Tank Info 2015.)