I would recommend one borrow not purchase this book, and after the half-way point return it. I found the first half extremely interesting and captivating. The remainder loses the reader in a case with racial overtones and fails to establish a logical relationship with the first half. I read a comment by another that seemed apropos: describe a new method of building an office building by explaining briefly a new building method and what the building might look like when finished. And, then talk about some of the surrounding pavement, you'd have "Blink," well--in a blink.