Densely packed science fiction that liberally jumps around across vast timescales, or why not universes. Full of interesting concepts, perhaps too many. It was published as a series of loose chapters over a long time, only tied together as time went on, and it shows, but it's still perfectly readable as a book although a little hard to follow. A slight criticism would be that all the characters speak in almost the same manner, and some of them even have a bit similar names, which makes it easy to forget who was who exactly. ( )