Anja Kreysing is a musician and researcher based in Münster, Germany. Her work moves between experimental music, sound art, and acoustic ecology, with a particular interest in how constructed and natural environments shape each other through sound.

For Flow, she worked on Segment 19 of the River Lech — a channelised, heavily regulated stretch near Sheuring, where dams and reservoirs for hydropower production have left the river, in the scientists’ words, “widely lacking natural geomorphic dynamics.” There are no restoration plans for this segment.

In today’s episode we’re speaking with Salma Ahmad Caller, a UK-based multidisciplinary artist with a strong connection to rivers — the Thames and the Nile.

Salma worked on Segment 15 of the river Lech — a stretch that, on the surface, has all the appearance of a secret, undisturbed place. You can hear the swans flying. A lone man unmooring his boat. And yet, just upstream, turbines roar. That contrast — between the dream of serenity and the reality of a world in crisis — became the heart of her composition.

Sergio's approach is rooted in his double life as developer and composer. He wrote computer vision code to extract the exact shape of the river from a satellite image, then simulated 300 stone trajectories along the current turning their coordinates into pitches, and those pitches into a long, quietly shifting composition for synthetic strings. The river didn't inspire the music. It generated it.