Notes on Project Natal, including how much space you'll need

Some advice for any Xbox 360 owners thinking ahead to the launch of Microsoft's Project Natal later this year: You might want to see if you'll need to reconfigure your living room. After all, the motion-sensing control system is no sit-on-the-couch experience. You'll need some space to move your body and swing your arms without banging into the coffee table.
To be precise, you'll want to clear an area extending at least 4 meters (a little more than 13 feet) away from the television. That's the back edge of the space to be taken into account by the Natal sensors. In terms of width and height, the field of vision naturally expands as it moves from the Natal device to that back edge, ending up a little more than 4 meters wide and 2.7 meters high (about 8 feet, 10 inches).