RFID Party
Screenshot: news.com
"The San Francisco Museum of Modern Art hosted an RFID reception the evening of Oct. 27, 2005. Attendees were handed radio frequency identification (RFID) tags to place on their clothes. Then their movements were tracked, and their location throughout the evening was indicated on a screen.
(...)
This output from the RFID tag reader, compiled by a Java program, was beamed on a screen and updated every minute. Each vertical column indicates a separate RFID tag. The colors show where in the room the tag was read. Newer arrivals are to the right, and black means that the person left the reception." (news.com)