Using a concave mirror, Airborne Ultrasound Tactile Display and Wii Remotes, University of Tokyo researchers have created a tangible hologram projector.
The mirror makes the hologram appear to be "floating" in air, while the Airborne Ultrasound Tactile Display shoots focused ultrasonic waves to create the feeling of a holographic ball or holographic rain falling on one's hand.
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The Wii Remotes? They're used to track movement — just one of many non-gaming use scientist people are finding for Nintendo's hardware.
Touchable Holography [University of Tokyo via @GreatDismal via Pink Tentacle]