The Cities . . . civism . . . these concepts are what
The Caves of Steel
is about. Asimov alternated exposition about the City and its culture with narrative about the murder investigation, complicating events, and character development. His writing skills had developed to the point that he was able to allow each of these elements to fall naturally and unobtrusively into place. The first extensive discussion of the development of the Cities, for instance, occurs as Baley is riding the expressway toward Spacetown to meet his robot partner for the first time and thinking about the differences between Spacetown and New York, between Spacers and Earthmen.