Today Sony unveiled a prototype of a 3D 360 degree display that can show 3D objects at all angles around the device. Sony insists that this is merely a technology prototype and that it has no plans to put this exact device into production, but that at some point the technology might show up in other things, depending on the application, and they're also not saying exactly how it works for now.

From BoingBoing:

The cylindrical display case is 27 cm tall with a base of 13 cm in diameter, and features a 96 by 128-pixel resolution that looks better than might be expected. The screen displays 3D objects including a cartoon character, car, globe, and people. Sony created these objects either in 3D on a computer or by taking photographs of them from various angles. The result is that the objects appear to have depth, and can be viewed from any angle on the horizontal plane by walking around the display screen.