"Roemer-Nordseite" was conceived as an "interface": environmental sounds trigger light changes on the facade of city-hall Frankfurt a.M. A light-system consisting of 16 elements was fixed to a section of window-crossings. Each element contained, according to its position, 2, 3, or 4 spotlights, which could be independently dimmed and/or lit. The sounds picked up by a microphone on the facade were realtime analysed and translated into subtle light-movements which changed with the attack and duration of the respective sonic event.

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