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If locking the door sends the wrong message and the â€œDo not disturbâ€ sign doesn't work, now there's a third option: disappear the doorknob. This smartly designed doorknob by Arnaud Lapierre is one of those â€œwhy didn't I think of thatâ€ moments. You can't make the whole door disappear (or the kids) so why not the knob.