What are the differences between the "Two Cities"?

From the text:

Once upon a time there were two cities within a city. One was light and one was dark. One moved restlessly all day while the other never stirred. One was warm and filled with ever-changing lights. One was cold and fixed in place by stones. And when the sun went down each afternoon on Maximus Films, the city of the living, it began to resemble Green Glades cemetery just across the way, which was the city of the dead.