Sonars “sense” the physical location of people in relationship to a video monitor. On the monitor is a character who, when the room is empty, cries out for company. When a visitor enters the space, he or she triggers the sensors, which, in turn, trigger canned responses from the video character. When the visitor is far away, the character begs her to come closer; when the visitor approaches, the character becomes agitated and tells her to “back off.” This attraction/repulsion cycle continues indefinitely.