The work shown here is about noise-reduction walls, which are erected almost everywhere on the territory in order to insulate specific sectors phonetically. These devices are built due to a positive political intention notably to protect people from annoying noises caused by highway traffic. They have nevertheless an opposite effect which is to delimit and to contain the landscape, transforming it from a smooth into a striated space. On a more metaphorical level these constructions could be seen as signs of a country shutting itself in. I use these walls as a pretext to illustrate my own vision of the swiss landscape.