The virtual objects appear in mid-air thanks to an LCD and a concave mirror. The sensation of touching the objects is created using an ultrasound device positioned below the LCD and mirror. The airborne ultrasound tactile device used to produce the sensation of touch was demoed at SIGGRAPH in 2008.
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Chris Harrison, a researcher at Carnegie Mellon University whose human-computer interaction work we've written about previously, will demonstrate his new scratch input technology. The system turns any surface into an instant input device by sensing the unique sound produced when a fingernail is dragged across it.
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