Very good transcendental-hard-SF

I admit I was not always sure exactly what was going on, and reality was sufficiently malleable ATV times that the author could have pulled any rabbit at all out of any hat and I would probably have nodded and accepted it.

On the other hand I also had the strong impression that the author actually had it all worked out and was not in fact winging it, and someone with more discipline than I have could have followed along closely.

Mind-bending, wild, satisfying.