is a meteo-electronic installation that converts real-time, thanks to an infra-red laser beam and a telescope sharing the same optics, the height, density and structure of clouds into sounds and musical sequences. The melodies and sounds are determined by factors such as cloud height, density, structure, luminosity, and meteorological conditions. Each cloudscape produces a particular kind of sequence. The Harp is polyphonic : it can sing on many different voices simultaneously, each one being mapped on a specific altitude range. It sings 24 hours a day, 365 days a year, by any weather. When the sky is blue, it remains silent. The range of the instrument is 25 000 feet or 8 kilometers, which means that some high stratospheric clouds, such as cirruses, are not detected.
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