“Still Alive” from Portal played by a Fiber Laser. ”The laser beam makes sound when it strikes the plate. By turning the laser on and off hundreds of times per second it acts almost like a speaker cone moving back and forth hundreds of times per second - making various pitches. Some pitches are off key and will always be due to the laser “only” being accurate to .001”.”
(Source: rockpapershotgun.com)
