"A weather beacon is a beacon that indicates the local weather forecast in a code of colored or flashing lights. Often, a short poem or jingle accompanies the code to make it easier to remember."
quote from wikipedia

The project takes as a starting point Brussels’ 145-meter-high Dexia Tower, from which 4200 windows can be individually color-enlightened. For the next few months, the weather will forecast tomorrow’s weather for Brussels in collaboration with the Royal Meteorological Institute of Belgium. The project displays tomorrow’s temperature, cloudiness, precipitations, and wind by using colours and geometrical patterns to visualise this real-time provided data by the RMI.

A colour code corresponds to tomorrow’s temperature compared to the monthly average, linked to a scale of colour temperatures ranging from violet (-6° or colder), blue (-4°), cyan (-2°), green (monthly average), yellow (+2°), orange (+4°) to red (+6° or warmer). For example, if tomorrow's temperature is two degrees higher than the monthly average, the tower colour is ‘yellow’. Furthermore, the level (dark / light) of this colour corresponds to the light condition of the sky for the upcoming day.

Geometrical patterns are constituted of small lines that constantly reorient, causing patterns and symbols to appear. These patterns are visualising tomorrow’s cloudiness and showers (rain, snow, ice, etc.) and wind. In between the different patterns, the vectors align to horizontal or vertical lines, forming transitions. The resulting geometric play of colours and shapes mirrors tomorrow's'sky'' condition. The transcription of common data into light establishes the tower as an urban landmark, a cpllective sign.