I know I'm pretty liberal with the 5 star thing on amazon.com, but if I had to revise all of my previous reviews, this one would still get 5 stars. For me, this book represents an amalgamation of all the information our civilization has accumulated over the last century or so.
Based on a solid foundation of science and psychology, chemistry and biology; this book offers your every day average psychonaut the opportunity to understand both personal evolution and the evolution of humanity, as well as where we may be going. Most comprehensive in nature, the human organism take the form of an advanced bio-computational organism of eight circuits that draw from Freud, Jung, Tranactional Analysis, Darwinian evolution, Neurophysiology, psychopharmacology, and an entarouge of Leary's personal research.
As with all of Leary's books the reader should take the presentation of facts lightly. Not to say that they are false or improperly assumed details, only that it is all informtiaon filtered through the understanding of Leary himself. My use of this book - used as companion to Angel Tech, Promethius Rising, and a host of other 8-circuit oriented books - has me re-structuring the entire system from my own point of view, and relating each ciruit to all areas of my life, as well as using it as an interpretation method for better understanding of yoga, magick, science, and psychology. As a whole any book that prompts the user to better understand themselves from a wholistic point of view has my thumbs up.