The ICT Graphics Lab at USC has developed a 3D projection system. This is not your run-of-the-mill, 3D  glasses required projection. Rather, it uses a rotating mirror and specially designed circuitry with an off-the-shelf projector. The result is a projection which you can actually move around and view in 3D. You really have to watch the video on their page to get the full effect, or rather, partial effect. To get the full effect, I'd imagine you'd need to see it in person.

[via PromoMotion]