I read this book several years ago, and have never forgotten its impact upon me. The book delves very profoundly into these three aspects of reality: time, space, and knowledge, and opens them up to a radical degree that is hard to convey in this short space. I was especially blown away by his analysis of time, which discusses the way the sequential nature of moments (past - present - future) is only a phenomenon of our vastly limited perspective, which is itself given by 'time.' How our confusion, our misperceptions, and ultimately our suffering in life are given by 'time'. This probably makes little sense, but if you're interested in time, you will love this book. The book is not easy to read, but it is extremely clearly written. It's difficult because the concepts are so radical, and challenge pretty much everything you 'know'. It comes with lots of experiential exercises that are designed to help you truly 'see' the vision that is being discussed. The exercises are very challenging, and I found myself not doing them but feeling guilty about it. (Many demand a high degree of visualization ability, which I've never had much talent for). If you want to read a superb, but much more accessible book by this author, try "Gesture of Balance," which is probably the best book on meditation I've ever read.