Abstract :
On YouTube, there´s a video of animated green mushrooms spinning around in a three-dimensional field, with a sound track of strange electronic tones. That premise itself is nothing extraordinary-the Internet is full of stranger things than dancing mushrooms. But what makes this video special is that the sounds are creating the images onscreen. Since the video first appeared last year, a lot of people have been skeptical about the 3-D graphics effect produced-including the editors here at IEEE Spectrum, until we dug out an oscilloscope and played the sound file into it for ourselves.
