Just finished this book. A great exposition of how humans develop higher levels of "consciousness" as they grow chronologically and culturally. Gives a nice framework for understanding how many can see the same phenomena so differently and all be right, from their particular mode of understanding, how important it is that we develop our capacity to take higher levels of perspective taking are to meet the demands placed upon us by modern and post-modern life, and, probably most importantly, why we have to meet everyone where they are on this spectrum, not where we would like them to be. Highly recommended. Its relevance to Buddhist practice is that studies suggest meditation is a reliable way to raise one's level of consciousness, presumably by raising one's ability to objectify the parts of the "self" and of other "selves".