Waste-to-energy Power Plant Facility, Copenhagen, Denmark

The designers explain: "The rather abstract pollution aspect will be somewhat more graspable and understandable, something you can see and relate to. The smoke rings are spectacular and highly aesthetical, but linked to a controversial theme at the same time. Most of the recently built power plants are merely functional boxes wrapped in an expensive gift paper. We want to do more than just create a beautiful skin around the factory. We want to add functionality."