Creating Categories

I really want to read this book. It looks so fascinating, and was mentioned in our class today when talking about our beliefs, and how we categorize our beliefs into different areas. The way in which we categorize objects, people, ideas is often incredibly abstract, based on beliefs we have created for ourselves that we often spout out as knowledge. I'm not too confident, however, about this entire subject, which is why I'd really like to read this book -- just looks so fascinating. Anyone read it before?