I am staying at an airport hotel in anticipation of an early flight tomorrow morning. The room is typical for a cheap modern hotel – a bathroom next to the corridor. There is a space between the door to the corridor and the bedroom that is alongside the bathroom – a sort of lobby within the room. My room is opposite the lift – one that talks to you about which floor you are on. To mitigate the noise (I suspect) the bathroom door opens to close the little internal lobby from the bedroom (and vice versa). A little like Duchamp’s Door (see link). The space is very small for my phone camera to capture, but I’m sure you will get the idea.