Outrageous questions and complex answers. This collection of short stories provides a rich ground for imagination.
Chiang is obviously very focused on ideas. There is a lot of science and math involved. There is also a level of abstraction that is beyond good and challenges your own thinking.
The book was great, though some novels ("Tower of Babylon", "Liking What You See: A Documentary") were better than others ("Division By Zero", "The Evolution of Human Science").