active-shutter glasses are a roadblock to 3D adoption? Wait until you get a load of this, the N-3D from Aircord Labs, a glass pyramid with semi-reflective sides that allows you to peer through while reflecting the image of a screen above. In this case the screen is provided by an iPad which, as you can see in the video below, separately renders three sides of an object. Each slab of glass reflects a different rendering and, hey presto, changeable perspective as you move from side to side, reducing the usable screen real-estate on the iPad by at least a third and producing an effect slightly less compelling, but slightly more portable, than that Time Traveler arcade game that used to take four whole quarters to play. No word on whether there will ever be a take-home version, but get yourself a sheet of plexiglass and you could probably make your own.