Walling and Hicks make a direct assault on the "Everest" of scientific mysteries. The authors trace the first glimmerings of consciousness in evolution and during emergence from anesthesia. There are no formulae or equations; all the difficult concepts have been presented as allegories and pictures. Unlike many philosophical books about consciousness, they have evidence to back up their ideas. This book is also an attempt to bridge the chasm between science and religion which the authors believe to be largely unnecessary.