Enter Displair. This little-known company was catching a lot of attention at CES 2013 with its interactive screen-less display. Screen-less? Say what? Yes, you read that correctly. Displair does not use a panel or screen of any kind to display an image. What it does is use water particles to reflect an image from a special projector, leaving you with a picture that floats in the air. Now what is so special about this? How is this special projector and water particles acting any differently from a plain ol' projector with a screen? First is a more mundane reason: your hand can pass through the water particles, and your hand can't. In addition, this special project detects hand motions, so you can play Fruit Ninja using your hands to actually cut through the fruits that pop up on the screen. The second, but much more interesting reason, is the potential for multiple layers of projected images on the water particles. AKA Holographic images. That you can interact with with your hands. IRON MAN WORLD, HERE WE COME!
Source: PC World