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To everyone above, go watch the Dr. Marks videos.  They're quite insightful as to what was going on with the tech.  For 3D tracking, there was kinect, and there was a brightly coloured object.  To tell the truth you can do a lot of what Move can do with just a ball and a stick (Which was demonstrated).  So when they were weighing in options; expensive camera for 3D tracking, or a ball and a stick... for 3D tracking.  Both did the same thing at the time and one is a lot cheaper than the other.