If you've ever stayed in a hotel you've probably seen one of those "do not disturb" signs that you can hang on the door handle.
This one is a little bit different - quite a clever twist on an old concept. Turned one way it says "go away", but if you twist it the other way it invites you in...

More info here
This one is a little bit different - quite a clever twist on an old concept. Turned one way it says "go away", but if you twist it the other way it invites you in...

More info here