Yoichi Ochiai,Takayuki Hoshi and Jun Rekimoto from the Nagoya Institute of Technology in Tokyo have figured out a way to make objects levitate using the sound coming out of an array of speakers. They can then move these objects around by changing the sound coming out of the speakers. The objects essentially being trapped by standing waves. Geeky? Yes. Amazing? Without a doubt.
For more information on these experiments you can look here: http://96ochiai.ws/3DOFacoustic
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