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"Using Wi-Fi signals to see through walls, the &amp;#039;Wi-Vi&amp;#039; system acts to provide the masses with cheap and effective x-ray vision. Developed by researchers at the Computer Science and Artificial Intelligence Laboratory in MIT, the system lets anybody see what&amp;#039;s happening on the other side of a wall. Wi-Vi uses technology similar to radar and sonar. However, the ingenious system uses Wi-Fi signals instead. The system uses only one receiver to send out or receive Wi-Fi signals. Since signals can penetrate walls, the system can detect movement without a line of sight. Since Wi-Fi signals are so widespread, Wi-Vi has the potential to be used for gesture-based controls. The system&amp;#039;s ability to see beyond walls means that the device can let you control your gadgets no matter where you are in your house."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.trendhunter.com/trends/wi-vi>