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By the use of motion sensors, human motion is detected and the door knob that is usually flushed with the door would protrude itself towards the user.
When no human presence is detected, the knob is hidden within the door itself, thus preventing visual pollution and reducing the chances of accidents.
When the door is locked, the knob moved inwards into the door, creating a slight indentation in the flushed surface as a form of visual feedback to the user, telling him that the door is locked. This reduces the chance of disturbance to the person in the room when people try to turn the conventional door knob when the door is locked.
National University of Singapore