{#image172}A memorable show during the Elektrafestival was the Laser Sound Performance by Edwin van der Heide. He used two lasers and (I think) motorized mirrors and filters to create laser patterns on the wall and in the smoke filling the space. The sound was mostly sine tones, sawtooths and various types of noise at an extremely loud level (even with ear plugs). Not really sure how he did it, but there was a really tight synch between the movement of the lasers and the sounds.