* A technologically advanced, but possibly dystopian city: The book depicts a technologically sophisticated urban environment, but it also highlights aspects of social inequality and neglect. The contrast between the technologically advanced infrastructure and the struggles of many residents creates a somewhat unsettling atmosphere.
* Various distinct locations within San Francisco: The narrative isn't confined to a single location; it explores different areas of the city, showcasing the contrasts between wealthier and poorer neighborhoods, reflecting the city's socio-economic diversity. Specific locations are not always explicitly named but are implied through descriptions of buildings, environments, and street life.
* A sense of both anonymity and community: The vastness of the city creates a sense of anonymity for some characters, while others find belonging within small, close-knit communities. This reflects the complexities of urban life.
In short, the setting is a fictionalized, yet recognizable, version of San Francisco, used to explore themes of social disparity, technology's impact on society, and the resilience of children in challenging circumstances.