To commemorate the late Vernor Vinge, I decided to read A Fire Upon the Deep to Boen. Not remembering how long a book that was, I placed a hold on A Deepness in the Sky at the library. It arrived long before we were finished with the previous book, so I started reading it since progress was slow on the former.
I keep forgetting how many layers A Deepness in the Sky had. You had the spider-like aliens, which are very different from the earth-inspired spiders in Adrian Tchaikovsky's novels. You had the huge differences between the Qeng Ho and the Emergent cultures, both technologically speaking as well as in attitude, and you had the hero protagonist of this novel, Pham Nuwen, who also featured strongly in A Fire Upon The Deep.
The interaction between all the characters demonstrate depth, development and growth, as does the realization of the spider civilization. What's even more important is that on this reading of the novel, I realized that the eventual victory of the more sympathetic side is never described, only alluded to. Not only that, even the mechanism of that victory is only hinted at. That's because the main point of the book is the development and growth of the main characters.
This is a long book, with a lot going on, and a lot of fantastic ideas that less writers would have developed into individual novels by themselves. Thoroughly enjoyable and worth re-reading. Recommended.