If you wanted to demonstrate Leap Motion's low-cost augmented reality headset, how would you do it? Create a flashy, action-packed showcase? Leap Motion has a different idea: an invigorating game of ping pong. The company has crafted a demo that combines the Project North Star headgear with paddle controllers to pit the wearer against an AI opponent at a real ping pong table. It's not mind boggling by any stretch, but it's a good example of a fast, intuitive AR experience that depends on high accuracy. You can juggle the ball and serve it as naturally as you would if it were real. And importantly, there are behind-the-scenes developments that could influence AR going forward.