In August 1946, Marcel Duchamp spent five weeks in Switzerland, and stayed at the Hotel Bellevue (today, Le Baron Tavernier) near Chexbres, on Lake Geneva. It was here that he discovered the Forestay waterfall, which was to become the starting point for (and ultimately the landscape of) his enigmatic and final masterpiece, "?tant donn?s: 1 la chute d'eau, 2 le gaz d'?clairage" ("Given: 1. The Waterfall, 2. The Illuminating Gas"). Now, for the first...