Referencing sensory awakening –Optimal Tonus– takes its title from the book Sense Relaxation: Below your mind by Bernard Gunther: a particular illustrated text, where one can find exercises to relieve bodily and mental tension through instructive methods. In one of the chapters in this book Optimal Tonus is construed as “a dynamic concept in which the organism automatically adjusts to the amount of muscular tension necessary to perform (any) particular task”. It goes on to illustrate the example of the cat “sitting at ease, completely alive, eyes open or closed, breathing easily; ready in an interested instant to spring into action”.