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"Last week Valve showed off an impressive Portal turret replica, but didn't mention where the thing came from, or why. Now it's posted another video of the original unboxing, and mentions that like its earlier TF2 turret, this is a Weta Workshop project complete with motion sensor for tracking. Those flashing lights appear to be just for show, but with both of those monoliths patrolling the lobby we'll probably wait for an invitation before stopping by."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2012/09/20/valves-full-scale-portal-turret-is-another-treat-from-weta-work/>