This is the 4th book of Spokes of the Wheel; about the physiology and ecological interfaces of the human body.
All organisms are an intertwined complex of energy, consciousness, mind, and body, with greater commonality than is generally recognized. Our focus on what we facilely see gives us greater regard for differences than similarities.
Animals are symbiorgs: surviving by hosting multitudes of microbes which belong to a plentitude of species. Despite the diversity there is great harmony within.