The Pergola of The Golf Club at NINE BRIDGES is a structure built on a location that honors an old sacred tree. The Chinese hackberry, which stood for roughly 600 years before the present golf course was constructed, unconsciously instated a place of animism. The pergola rearranges the site in accordance with the orientation of an aged tree and finds its project motifs in natural algorithms. Inspired by the essential structures of natural algorithms, we have devised a 'dual-duct system that integrates both the structure and the facility. The inner duct is used for ventilation and wrapped with a 12mm thick steel frame to form the overall structure. The two ducts are covered with highly dense insulating material in between, to prevent dew condensation from indoor-outdoor temperature difference when operating cooling and heating systems.