Russian startup Nettle, which is based in the Skolkovo Tech City area, is showing off a $28,000 holographic gaming set-up at TechCrunch Disrupt SF’s hardware alley. The Nettlebox rig consists of a 3D plasma display, with four fisheye lens infrared cameras sited at the corners to track the position of the gamer – who wears a pair of 3D glasses with two infrared lights on board.