Here’s Godfried using The Invisible Instrument, a kind of giant theremin which uses either radar or sonar waves to translate a performer’s movements into music. There’s a very technical explanation here, complete with schematics. Godfried has used the invisible instrument in a number of his performance pieces over the years, including Songbook illustrated above, and the ongoing electronic opera TechnoFaustus, which also uses "pressure transducers, contact microphones, acceleration-sensing devices, pyroelectric transducers... and 1 to 3 naked techno or break dancers".
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Labels: Godfried-Willem Raes