Ok this is it. My final image.
… ¨flat white concrete structures, resembling thick building foundations. Beyond the parkland, a narrow lake or river about a kilometer across ran east and west completely around the chamber.
The bridge pointed toward a city.
It could have been Los Angeles on a very clear day, or any other modern terrestrial city, except for the surreal exaggeration. It was bigger, more ambitious and ordered, more architecturally mature. And scattered throughout the city, like bumpers on a pinball board, were the biggest structures she had ever seen in her life. Easily four kilometers tall, they resembled upright chandeliers made of concrete, glass and shining steel. Each facet of the nearest chandelier-structure was as large as entire buildings in between. The chandelier resemblance increased as she looked up and saw them suspended from the chamber floor overhead. Across the two layers of atmosphere, fifty kilometers away, the city became beautifully unreal, like a model behind dusty glass in a museum… ¨