It was only a matter of time before sound and vision became a soupy blend. Structurally, sound waves and light waves are not so distant of relatives (take out your books, class. A bit of a physics lesson), the main differences being a) velocity, with sound waves traveling at a speed of approximately 1,100 feet per second, and light waves traveling at approximately 186,000 miles per second, and b) wave composition - sound is composed of longitudinal waves and light is composed of transverse waves in an electromagnetic field. As a result, it seems only natural that there's now a great emerging trend to use interactive light as a sort of musical instrument.
Well, Nine Inch Nails, with the help of Montreal-based new media agency MomentFactory has indeed made a fine bisque. For those of us lucky enough to catch the Nine Inch Nails/Jane's Addiction tour (and/or to catch the NIN Bonnaroo set), you'll be dazzled by the multiple large LCD panels that respond and react to the band's sound and movement.
Some great video footage below (although this may or may not be considered appropriate for the young ones, depending on which side of the Tipper Gore/Frank Zappa debate you fall on).
Take a look:
Nine Inch Nails: Only (Live in HD) from WhoRu? on Vimeo.
Be sure to check out the 'Making of' video (very much worth it) to learn more.
You can see more cool interactive light shows, including this one, through this recent FastCompany article.