Megazeichen, 1990
Mannesmann High-rise, Düsseldorf
Over the course of six weeks, the lights were kept on in certain offices and hallways of the Mannesmann building; the illuminated windows produced a sign that could be seen from a distance. The lighted manifestations on the façade of the multi-storied building changed every week, but as time wore on, it was possible to recognize the overall systematic program.