John C. Lilly's isolation tanks are a popular approach to sensory deprivation, promoting relaxation, heightened awareness, time distortion, and even hallucinations. Sensory deprivation tanks, and the weightlessness sensation that comes with float therapy, create a sense of detachment from the world. In essence, it fosters a space in which you are not even bound by the rules of gravity. Sensory deprivation chambers have been found to lessen stress and relieve symptoms of anxiety and depression.