The Department of Liminal Places was created after Mara Devlin objected to the word atmosphere. She wanted the Reader to name the actual rooms: hospital corridors, transit platforms, school hallways, service tunnels, waiting rooms, abandoned malls, and public interiors caught between instructions.
The department's files are deliberately specific. A place is not included because it is vaguely eerie. It must have a public function, a route through it, and some evidence that people have just left, are being processed, or are expected to return.
This is where the Reader can become most useful as an index. The department sends people outward to real photographs, maps, archives, and footage so the feeling is not just aesthetic but located.