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Visitors of the MoMA's reception on Thursday evening were given a RFID tag to wear. Each tag was implanted with a unique number that could be tracked when it came within range of one of the RFID tag readers.
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.