Hallway: empty flat
You just got the keys and there is nothing in it.
What gets in the way
An empty space cannot be pictured: with no furniture, you cannot judge a size, a colour or how you would move around. And in a hallway in particular, it is a dark corridor where coats get dumped.
What seeing it first changes
You see the room furnished before buying anything, so you stop getting dimensions wrong. What moves is the storage, the mirror and the light fitting — the walls, windows and doors stay exactly where they are.
Try it on your hallway Your photo, your walls. Not a catalogue image.