Raftsman Martin Sprang is holding a display board featuring a technical drawing showing the framework of a wooden sailing ship’s hull under construction – with the characteristically curved ribs, for which trees with naturally crooked trunks were specifically selected in the Black Forest. Spreng, chairman of the German Rafting Association, is demonstrating the historic Black Forest rafting tradition at the Monhardter Wasserstube near Altensteig, Baden-Württemberg, Germany. Rafting has been recognised as a UNESCO Intangible Cultural Heritage since 2022.