eavesdropping potato chip bag
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Eavesdropping by Reading Vibrations on a Potato Chip Bag

MIT grad student Abe Davis, along with colleagues, has demonstrated the ability to eavesdrop by reading the vibrations on objects such as a potato chip bag. Dubbed the “Visual Microphone”, Davis was able to use a regular digital camera to perform this feat. Which means that someone could appear to be filming the table next to you, but are actually about to decode what you are saying. Davis, along with MIT professors Frédo Durand and Bill Freeman, have also used this method to eavesdrop on the vibrations in a glass of water, and even on the leafs of a potted plant.