In the forest, between the moor and the thicket, I hid a radio microphone. Armed with a powerful loudspeaker, I set off through the forest with a group of guests and hosts from ReRouting Walking AiR Frohnau. To determine the route, I used a point at the intersection of the diagonals of the fence at the entrance to the forest. From this point, we simply had to go strictly straight inwards. I did not say where exactly the end point of the route would be. I just said: “You will hear it.” I gave everyone a protective headset. As we approached the microphone, the forest was deafening with acoustic feedback.