The darkness envelops me like a warm blanket. I feel safe in it and my senses can open up like my pupils. Where do we still find darkness in public spaces today, except during power cuts? With its rich sound spectra, the double bass is a mysterious instrument. The low frequencies are physically perceptible, draw us in and defy quick comprehension.

What does it sound like underground? I have heard many fascinating recordings with geophones: the movements of countless creatures and their feedi...