The task was to build an unconventional indoor swimming pool. It starts with the concept, a wave. The shaft should enclose the entire building, with the roof as a cloth stretched over it. The roof holes form spongy patterns and give certain zones additional light. Besides the pool, there is a spa and a restaurant which define the shape of the roof in their spacial arrangement. The rooms and the floor are made out concrete and form a uniform topographic landscape. A wooden structure connects the roof. The differentiated wooden structure results in ever new perspectives and deep vistas.