Robert Mathy: Light Frequency Fingertips, Sound Instrument 2009

YouTube via MediaArtTube — May 17, 2010 — "'Light Frequency Fingertips' is composed of four fingercaps, each containing light sensitive phototransistors. The fingercaps (made of bicycle tubes) are especially customized for the thumb and forefinger of both hands, and transform light frequencies into acoustic signals. Light, emitted by the displays of activated mobile phones, functions as the origin of the sounds. As each mobile phone's display generates a different light frequency, each results in an audio signal with a different pitch. In addition, other electronic devices, such as flashing bicycle lights, can be used to generate rhythmic tones.

Performance: If the sensors are connected to 3 volt button cell batteries and the stereo jack is plugged into an amplifier, it's time to play! Any subtle movement of the fingertips creates a slightly audible change in sound. Fading and mixing is also done by moving the fingers. Naturally some mobile phones switch into sleep mode while others stay active, so this adds a extended visual feature to the performance. In order to avoid interference or a disturbing hum, the instrument should be used in dark environments.
More info: http://www.robertmathy.com/lightfrequ..."