But that may soon change as a group of researchers from the University of Tokyo are working to develop holograms that you can touch and watch react to your presence. From the Siggraph website: "This project adds tactile feedback to the hovering image in 3D free space. Tactile sensation requires contact with objects, but including a stimulator in the work space dilutes the appearance of holographic images. The Airborne Ultrasound Tactile Display solves this problem by producing tactile sensation on a user's hand without any direct contact and without diluting the quality of the holographic projection."
It's all pretty insane, and I can only imagine where this technology will be 20 years from now. Check out a video demonstration after the jump to see what I'm talking about, and then let us know what you would use touchable holography for. Or, wait -- on second thought, I don't think I want to know.
[via The Awesomer]