Casagrande & Rintala have designed a floating sauna for the Rosendahl Village in Norway. It literally floats on the water and is 100% functional. It is anchored in the middle of a fjord.
When it is in use, it has semi transparent walls, to provide some privacy for the user. At night, when it is not in use, it glows like a lantern on the soft surface. Access is only allowed by rowing boat and soap is strictly prohibited due to ecological reasons.