Commissioned by the non-profit organization Figment, 12 students from GSAPP Columbia designed and built a tree house on the governor’s island named FELIX. Our design intent is to have FELIX become the seed for a new type of treehouse, which can grow for the next 5 years by aggregating over the landscape, creating a dynamic playscape for everyone to enjoy. Taking inspiration from the nature, we propose a flexible modular system based upon standard wood members which are eco- friendly, reusable and mass produced. The pavilion is designed as an accessible installation by nature, of nature, and for nature.