Answer:
Shang, like other ancient Chinese cities, had two city walls, one inside and one outside. The common people could live within the outer wall but not beyond the inner wall, which contained a temple, cemetery sites, bronze foundries, bronze casting areas, and bone workshops. Thus, the inner walls encircled a zone of the political elite and craft specialists, who collaborated to plan important ritual performances. The architecture of these cities was designed in this way to separate different social classes.