Cool video, have you ever thought about other applications. For example a soldier who has vibration sensors on his back and can feel that a threat approaches (outside of his vision area) and from where it approaches.
Or someone who is driving a car, like a formula 1 driver and has the vibrations in his chair and can "see" that someone is about to hit him.
A weakness I see with the current application is that a stick doesn't require a battery and is very cheap.