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