9 January 2013 12:11 am GMTUpdated: 9 January 2013 12:54 am GMT
Photo by: Josh Lowensohn/CNET
/ Caption by: Josh Lowensohn
CNET editor Scott Stein holds up the 20-inch prototype so you can see how big it is next to a normal human.
There's not much on the back besides some simple brushed metal.
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