Multiple technological innovations allow air guitar to be played as a real instrument, producing sounds that depend on the air guitarist's actions. In 2005, students from the Helsinki University of Technology developed a system that translates hand movements into electric guitar sounds, resulting in a functional air guitar. The system, consisting of a pair of brightly coloured gloves and an infrared camera, is one of the most popular exhibits at the Helsinki Science Center. The camera recognizes the distance between the two gloves and the strumming movements made by the wearer to synthesize an electric guitar tune, working using only six notes.