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Use the Force!
 
The University of Tokyo is conducting research into a new technology which may allow for controller input by simply using only your hand in mid air, and could offer force feedback type sensations too. The scientists responsible for the research have labelled the new technology an 'Airborne Ultrasound Tactile Display', and there are two components to the system, a display which uses ultrasonic transducers and a tracking camera for the hand movements.
 
The four scientists responsible, Takayuki Iwamoto, Mari Tatezono, Takayuki Hoshi, and Hiroyuki Shinoda presented their project at SIGGRAPH2008, and they had the following to say:
 
With the recent progress in computer graphics, physical simulation, and visual display technology, demands on haptic interaction techniques are increasing. SIGGRAPH 2007 featured many presentations on visual displays that enabled users to manipulate 3D graphic objects with their hands. If tactile feedback could be provided to the users' hands in 3D free space, the usability of those systems would be considerably improved.

This project demonstrates an innovative tactile display that radiates airborne ultrasound and produces high-fidelity pressure fields with multiple ultrasound transducers based on wave-synthesis techniques. Airborne ultrasound can be applied directly onto the skin without the risk of penetration. Tactile feedback is provided to the users' hands without requiring the use of gloves or mechanical attachments
 
You can view the demonstration video below:
 

This looks like it could potentially offer a much more immersive experience when gaming. You can view the research abstract here. You can discuss in our forums here.