Several lasers installed in a room are catching sounds out of the air. You are reaching for strings in a dark room – a kind of “air-guitar”. A laser is projecting beams and with help of a hazer they become visuable. If you try to grap a “light-string” with your hand you are able to hear a sound with help of sensores. You can play with other people and are even able to hold the sound through holding your hand consistently into the laser beam. By echo and hall a certain deepness is created.