Simon liked his daily stroll along the mighty North Sea (which came much closer to Bruges than it does today), but it annoyed him to be pushed by the wind at the start of his promenade, and having to fight against it when going home. Inspired by the sailships at sea and a friendly passing-by Muse, he made a sail to carry with him, so he would be able to sail sharply near the wind, and get home comfortably.