Solomonia points out a CNN story on projecting a video image without all that mucking about with screens and such.
[Inventor] Dyner has disclosed few details about how his Heliodisplay works. The machine modifies the air above a video projector, creating a working, 27-inch screen that can display any kind of video. The image is two-dimensional, can be seen from several angles, and can be manipulated by hand.
Too cool. (Hat tip to One Hand Clapping for the heads up.)