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.
A somewhat similar system was developed by IT7Ts Research Lab in the 1950s. It used a cylinder containing an inclined revolving screen excited by a scanning electron beam, and produced a true 3 D image, that could be viewed from any position outside the cylinder.
Can't wait for Nintendo's GameboyFOG to be released... sometime next year I would guess :D lol....