The Pattern Door Lock concept would enable you to come and go from your home without any need of a key. Certainly, technologies are already available that allow you to lighten your load in this way; however, many of them are prone to being compromised.
Kwon Hyuk-Sang's goal was to design a passcode access method that could not be learned by observation. The priority was to hide the buttons so that no passer-by would be able to see the PIN that is input into the modern combination locking system.
Keeping the door itself looking sleek and simple, the mechanism is actually embedded into the back of the elongated knob. The homeowner can grasp the Pattern Door Lock and press the four buttons with each of his fingers, initiating entry without revealing a thing.