It's reminiscent of the laser microphone, which measures sound-induced vibrations in objects by bouncing a laser off them, and reconstructs the original sound w

It's reminiscent of the laser microphone, which measures sound-induced vibrations in objects by bouncing a laser off them, and reconstructs the original sound waves http://en.wikipedia.org/wiki/Laser_microphone http://en.wikipedia.org/wiki/Laser_microphone