You can't get in
if there is no door knob to turn. That is the entire premise behind this design concept. No more low tech ties around the door knob. The doorknob condition
allows you to pull on the knob from inside the room to retract the outside door knob flush with the door. When you feel like granting access again, simply push out and restore the functionality of the door knob from both sides. Check out the pictures after the jump...
-via Oh Gizmo and Yanko Design