Hedgehog Door / door

Everyone has a period time when you do not want to be disturbed. Even if you have locked the door, someone will still come and knock. After a long duration of knocking, it will obviously mess you up.Hedgehog door is designed to keep yourself from being disturbed when you are occupied in a quiet environment.
If you want to have a quiet personal space, you can press the button on the handle and then the outer surface of the door will raise its projections,then people cannot knock anymore. The handle will rotate to the dark cell,so they cannot open the door from the outside .In the normal state, the hedgehog door remain as an ordinary door.