Weta Workshop is filled with engineers, and that means they solve problems. Practical problems. For instance, how Valve Software is going to keep its throng of Team Fortress 2 players in awe. The answer? Use a gun. Like this heavy-caliber, tripod-mounted, fastidiously crafted life-size reproduction of The Engineer's level 1 Sentry Gun, which features a bona fide motion sensor for tracking whosoever is fool enough to venture into Valve's geektastic lobby in Bellevue, Washington and touch the darn thing. We're ready to volunteer. Video after the break.