The forward gaze is followed by an upward gaze. The True Presence was developed as the first true presence detector. It reliably reports whether a person is in the room or not. This enables secure absence detection for the first time. With this information, lighting can be switched on and off reliably, without delay, avoiding unnecessary electricity costs. Its knowledge of actual presence or absence also offers many additional applications that are of great value for building management. Thus, it sets a new standard in modern building automation.