The basic approach behind this project is to create a modern aquatic sports centre open to swimming clubs that combines a maximum-quality architectural design with functional, economical and energy-efficient considerations. The space available for the Thurmfeld “BadeBox” ground plan is tight, its cubature being divided into separate levels that are adapted to the individual sections in such a way that the minimum cubic content is put to maximum use, giving rise to an effective and efficient building. The blue metal-sheet facade still gives the “BadeBox” an attractive, sculptural exterior that sends out a clear signal to the new area. This highly thermally insulated outer shell conforms to the Passivhaus standard, with glazing installed at specific points to provide views of the green surroundings. This has also been kept to a minimum in order to prevent both major heat loss and overheating.