What's one way in which Shang architecture reinforced the social distinctions of their society

Shang, along with other ancient Chinese cities, had two city walls-one inner and one outer wall. The common residents could live within the outer wall, but could not go past the inner wall, which enclosed a temple area, cemetery sites, bronze foundries, bronze casting areas, and bone workshops. The inner walls thus encircled an area of political elite and craft specialists, who together were the engineers of the important ritual performances. In this way, the architecture of these cities was designed to separate different social classes.