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Chaos Computer Club e.V.
Celebrating its 20th anniversary the Chaos Computer Club has made a special present to itself and the city of Berlin. From September 12th, 2001 to February 23rd, 2002, the famous «Haus des Lehrers» (house of the teacher) office building at Berlin Alexanderplatz has been enhanced to become world's biggest interactive computer display: Blinkenlights (a term defined by the Jargon File).
The upper eight floors of the building were transformed in to a huge display by arranging 144 lamps behind the building's front windows. A computer controlled each of the lamps independently to produce a monochrome matrix of 18 times 8 pixels. During the night, a constantly growing number of animations could be seen. But there was an interactive component as well: you were able to play the old arcade classic Pong on the building using your mobile phone and you could place your own loveletters on the screen as well.