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By regulating their breathing, which is registered by sensors on the belt they wear, visitors can alter the dynamics of the sounds reproduced around them and of the images projected on a surface (or, in an expanded version, four surfaces) in front of them. Their breathing causes the polygons in the computer-generated image to oscillate. The more regular the breathing, the more complex and chaotic the visual and acoustic processes become. Events in ‘Breath' do not take place in an entirely random way, for the time structure is programmed to make the visitor's breathing affect images that have just passed. Gabriel here creates a complex system of biological feedback that goes beyond the simple relationship between action and reaction.