Remember the holographic projection of Princess Leia in Star Wars? Well, that may be coming to reality soon, thanks to ... fog:

Researchers at Osaka University in Japan have made a 3D and 360-degree display that projects from a variety of different angles onto a cylindrical fog display. This combination of multiple-point of view projectors and the cylinder allows for a display that is 3D no matter what side you view it from, though in order to get a holodeck style of projection a much larger set of projectors, and a lot more fog, would need to be on hand.

Hit play or go to Link [YouTube] - more info at Physorg