The Jewish community in Poland wants to build a sail-shaped skyscraper like this one, from Japan. The planned building will tower over the old Warsaw ghetto as a monument to green self-sufficiency. The skyscraper (artist renderings in gallery after the jump) would use its voluptuous curves to generate enough wind power to keep the building running. It's also part of a trend in skyscrapers: some of the most futuristic buildings in the world are sail-shaped, with curved surfaces and a sharp peak. More cool sail-shaped buildings after the jump — some planned, some that already exist.

Photo by AP.