Because of the haziness, the cubes making up the towers of garbage had to be very large, otherwise they would have lost shape (in turn, this helped save rendering time).
The haziness of the book's structure grows organically from the material itself, as does the spookiness of it all, the eerie setting and unpredictable action.
With the shadows and haziness of the lighting, and the brightest part being the western sky, the landscape seems to be portraying dusk in the mountains.