Sensory Deprivation Tank for Floating

An isolation tank is a dark soundproof tank in which subjects float in salty water at skin temperature. It was devised by John C. Lilly in 1954 in order to test the effects of sensory deprivation. Such tanks are now also used for meditation, prayer, relaxation, and in alternative medicine.

The isolation tank is also called floating tank, however the correct name would be REST-Therapy tank since floatings scientifically name is R.E.S.T = (Restricted Environmental Stimuli Therapy) - Wikipedia