Forget "Do Not Disturb" hangers: simply retract the doorknob itself into the door. Ladies and gentlemen, we are finally living in the future.
The Doorknob Signal [Yanko via Geekologie]
Forget "Do Not Disturb" hangers: simply retract the doorknob itself into the door. Ladies and gentlemen, we are finally living in the future.
The Doorknob Signal [Yanko via Geekologie]