Some no-glasses or autostereoscopic 3-D include MIT’s smart multi-layer attenuator / polarizer displays, Seekway manufactures GIGANTIC volumetric LED displays with strings of thousands of LEDs, Takaki Lab at Tokyo University with one or more projectors and a horizontal turntable-like rotating screen. Also, Holografika has an autostereoscopic 3D cinema system whose rendering algorithms and optics provide 3D imagery on a cinema-sized screen. Also, an American company developing “angular-slice” projection 3D is Third Dimension Technologies.