A light and sound piece by LAB[au] in 2006 uses the movement of people in the underpass as the source of light and sound. The 12 meter long screen tracks human movement to generate visual and sonic elements. Uses two techniques to do so, firstly image recognition to create spatial sounds, and secondly ultra sound sensors to create visual echograms of the space constituting the background of the projection. There are graphical vectors on the screen which react to the human movement while the size of the elements is determined by the speed of the movement. The result of the screen essentially allows visitors to paint with his/her movements on the screen.
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