The Beacon Frame
PRISM reveals information about wireless devices present in the vicinity. By intercepting network protocol messages, data such as usernames, hostnames and IP addresses are publicly displayed.

Observers can gaze into a rotating prism and read disclosed personal information about the people around them.
PRISM was developed by Danja Vasiliev and Julian Oliver during ArtHackDay/Berlin event as a commentary to what NSA technology might look and function like.

The second version of PRISM was created during Transmediale 2014, Berlin. Official webpage is available.
Watch a video of PRISM in action:
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Build date: 29 September 2013
Built using: ARM computer running GNU/Linux, Pico video projector,
WiFi radio, Optical prism device, Rugged military case.