O + A have conceived a conceptual pool scheme for a river in Amsterdam. Entitled Urban Beach, the pool appears as a continuous band that is folded and lifted to create a mobius strip-like effect. The folding allows the object to become more flexible, and the architects see it as a framework for various programmatic activities, such as an open-air movie theater in the summer, or a wellness center in the winter.
More images and more about the pool after the break, via Dezeen.