This project intends to bring back the ecosystem which used to dominate Manhattan Penisula. Learning from the purification water process of the wetland with the help of various aquatic plants, the natatorium contains a similar system to remove the pollutants from the used water in the swimming pool. The used water in the pool that needs to be changed will be pumped up to elevated ponds or directed to the ground ponds with reeds, water lilies etc. After sometime, the water will be filtered by the plants and sand, and then will be redirected back to the pool. These treatment ponds provide an opportunity for the visitors to learn more about botany and ecology, and more importantly the historic environment of Manhattan. Formally, the building are composed of hexagon cells that resemble some plant cells seen under microscope. The swimming pool is given a central focus, so that everyone can have a visual response with the pool while they tour around the building.