ScienceUnwanted feedback: dronesTo play this audio please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoScienceMelanie Sevcenko06/09/2014June 9, 2014Nik Nowak's latest sound installation, ECHO, melds art, science and technology. He's created two autonomous robot drones that move freely about a gallery space. They're programmed to recognize visitors and monitor their movements.https://p.dw.com/p/1CEyEAdvertisement Report: Melanie Sevcenko, Berlin