The gCubik is a little 10cm (~4 inch) cube designed by Japan's National Institute of Information and Communications Technology (NICT) that can display 3-D images via integrated imaging technology and its multiple sides.
The NICT wants to significantly improve the display quality within 3 years. A wireless version is in the works as well. The institute aims at commercializing the gCubik for use in business and science. They say their invention could be used by video game companies, too, for example.
Sure, video games, that would be fun. But let's face it: the box was designed for 3-D porn. Can you imagine what a boob would look like on that thing? Yeah, pretty shitty. Still, it's a step.
UPDATE: I've decide the box looks like a ghost containment trap from Ghostbusters.
Amazing mini 3D-display cube developed in Japan [crunchgear]
Thanks Romeo, just imagine how awesome Portal would be on that thing.