Developed together with Hauptmeier/Recker, the permanent sound installation designed to last 20,402 years sonifies and materializes radioactive decay processes and extreme periods of time that defy our imagination. In the current global discourse about the extension of nuclear power plants, DECAY points to the still unsolved problem of where to safely store nuclear waste radiating over hundreds of thousands of years. It is intended as a sonic and semiotic warning signal, as a quiet but constant alarm bell to the future.