“Floating in the tank after a busy day’s work brings a great relief. Suddenly all of the stimulation of holding one upright against gravity disappears. One realizes that a good deal of the fatigue accumulated during the day is caused by keeping one’s body upright in a gravitational field. From a neurophysiological standpoint, one has immediately freed up very large masses of neurons from the necessity of constant computations (as to the direction of gravity, the programming by visual and acoustic inputs, by temperature changes, etcetera). For example, one’s cerebellum is now freed for uses other than balancing the body. In summary, then,”