A team of researchers at the University of Tokyo led by Hiroyuki Shinoda has developed a display that lets users "touch" objects that appear to float in space in front of them.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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