Touchscreen bath: Japan experiment projects interactive screen on bathwater.
“Touchscreen” Bath Puts Functions on Water’s Surface 
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Sept. 3 2013 2:35 PM

“Touchscreen” Bath Puts Functions on Water’s Surface 

For the liquid touchscreen to work, bath salts are added to make the water opaque, and a Microsoft Kinect depth camera sends signals to a computer based on hand movements.

Video by Reuters.

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