Under Scan is an interactive video art installation for public space. In the work, passers-by are detected by a computerized tracking system, which activates video-portraits projected within their shadow. Over one thousand video-portraits of volunteers were taken in Derby, Leicester, Lincoln, Northampton and Nottingham by a team of local filmmakers. For its London presentation in Trafalgar Square, Tate Modern filmed over 250 additional recordings. As people were free to portray themselves in whatever way they desired, a wide range of performances were captured. In the installation, the portraits appear at random locations. They « wake-up » and establish eye contact with a viewer as soon as his or her shadow « reveals » them. As the viewer walks away, the portrait reacts by looking away, and eventually disappears if no one activates it.