By Leo Kelion

On screen two animated "puppets" are wriggling around.

As the big blue hippo and thin red worm dance from side to side, on the bottom right of the screen their movements match shapes cast by images of two fluorescent green hands.

These in turn mirror actions being taken by SoftKinetic's demonstrator which is gesticulating wildly just 15cm in front of the firm's new DepthSense camera.

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