"Many people who lose a limb experience the sensation that it is still attached to their body. This is also often accompanied by a feeling of pain in the missing appendage. Amputees who experience "phantom limb pain" could find relief with a 3D virtual reality system that creates the illusion that they can once again control their missing limb. The person using the system wears a head-mounted display and operates a controller with their remaining limb. The system lets them control a virtual arm or a leg, which is shown in 3D in place of their missing limb."
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Check the Iarm: http://www.youtube.com/watch?v=IyklrMfj2ao
This link illustrates what I was talking about: http://www.humanupgrades.com/
Wow post Arnoud.. how would it feel to have phantom pains in phantom limbs..
Just imagine this 3D-tool could be used to learn a brain how to use a phantom limb that never existed on your body, like a tail or a "computer-claw" or a "backscratcher" of some sort. Suppose this leads to the conclusion that we would be better off with this extra-limb... Combine this with DNA-altering techniques and voila: You are upgraded! :D