Oh wow! This wasn't the one I was talking about, but very cool nonetheless. It's similar, but with keyboards. I hate posting this without evidence, but I thi

Oh wow! This wasn't the one I was talking about, but very cool nonetheless. It's similar, but with keyboards. I hate posting this without evidence, but I think there was also something having to do with watching a plant or a pane of glass vibrate to know what is being said inside a room. The keyboard noise and the vibrations may also be unrelated. If I can find these articles, I'll come back and post them here.