This is a very lazy book. He reuses characters from other novels. He resuses plot devices. I don't know how this is notable except that it sucks. The whole thing is so tossed off and so casual. It's worse than his other efforts in this area because those at least felt considered. This feels like he walked into the smithsonian and wrote a book in a couple days, just for the hell of it. If it was good, that would be extremely impressive. There are times, when I am trying to consider this as more than po-mo junk, that I think there is some secret critique of theoretical physics underlying all of this, and maybe it actually means something. But I couldn't find enough evidence, or enough consistency so I think this was probably written just to meet a publisher's demand for another novel. The worst (fiction) work of his that I have read, by far.