Chapter 28 guide

Trantor: ... almost no one depicts the world from the perspective of outer space.It has long been imagined by the common man as an inner world, its image as a dwelling-place under countless domes.However, it is not lacking in the exterior, and some holograms taken from space and survived to this day are sufficient to show varying degrees of detail. Notice the surfaces of those domes—the boundary between this sprawling city and the upper atmosphere... —— "Galaxy Encyclopedia"