Leap Motion, a San Francisco start-up, wants to change the way you control your computer with a little device it revealed this week.

The Leap is a small 3D motion sensor that goes in front of your computer and creates a 3D interaction space of 8 cubic feet from which you can use your hands and fingers to direct your computer.

Life imitates art ... Tom Cruise in the film Minority Report.

The makers of the device, which is reminiscent of Nintendo's Wii and Microsoft's Kinect, say it is 200 times more accurate than anything else on the market, no matter the price, and can track your movements "down to a 1/100th of a millimetre."