The Lausanne Jardins Festival in French-speaking Switzerland takes place every five years. In 2019, Hörstadt, together with landscape architects Susann Ahn, Philipp Urech and Matthias Vollmer, has developed two special instruments for it. The Vuachère River was once built over and thus forgotten. To bring it back to mind, the sound of the river is transferred up into the city through two sound pipes over twenty metres long. Since then, people could listen to the water. This became a common attraction. That’s why the city of Lausanne no longer wants to miss the sonic listening tubes, even though the festival already ended on 12 October 2019.