Paysages Disparaissant is an attempt to bring the observation principle (Niels bohr) concept into concrete terms. The visitor is immersed in an infinite world which can be explored thanks to controllers. The topology of the world is in constant change except where observation is made. As the gaze fades away from a location, this previously frozen part of the world is animated again so that when the eyes come back to a previously observed area, topology is different. A combination of several layered-noise equations is used as source material to instantly generate this virtual landscape. The work is composed of three parts. The first and main part is driven by a VR kit capturing head movements and acting as blinkers and a game controller to allow the user to walk around in the landscape. This interaction affects the second part of the work, a three-wall projection mapping. The third is a custom framed LCD screen. A sound-scape is also being generated according to the same source material and is influenced by the head rotation.