There’s no more natural control interface than yourself. This robot, developed by engineer Tsuyoshi Horo at Tokyo University, watches you with an array of eight cameras and creates a 3D model of your body. If you point your finger, the cameras will recognize the shape, and send commands to the robot to respond to your gesture. It’s way cool, but it’s not exactly portable, since the cameras are stationary. It’s able to do all kinds of things besides robot control; here’s a video of someone playing Half-Life 2 with body motions:

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