Raftsman Martin Spreng stands beside a felled Dutch fir ("Holländertanne") and shows a photograph of a historic sailing ship. Black Forest raftsmen felled particularly long, straight firs for Dutch shipbuilding – knot-free over long stretches and 30 to 40 metres long. Altensteig, Baden-Württemberg, Germany. Rafting shipped such timber here on the Nagold river until 1911. It has been recognised as UNESCO intangible cultural heritage since 2022.