The project "Querläufer", an interactive computer installation, is based on the principle of chrono photography: Movements are recorded in a way their course in time becomes visible in space. Unlike in the classical, photo mechanic chrono photography a video camera and a computer are being used to generate the image of time, therefore the development of the images can be followed in real time. The images recorded by a stationary camera pointing towards the visitors are continuously being fed into the computer and processed; a strip of time becomes visible, ever growing and stretching across the projection screen.