Introduction to the Thirty-six Yuanyang Pavilion (Eighteen Mandala Flower Pavilion): is the main building of the West Garden. It is exquisite and gorgeous. The hall is divided into north and south parts by partition fans and hanging drops. The southern part is called "Eighteen Mandala Flower Pavilion" and the northern part is called "Thirty-six Yuanyang Pavilion". This is a form of Yuanyang Hall in ancient architecture. The South Hall is named after the datura flower, which is the camellia. The North Hall is named after thirty-six pairs of mandarin ducks that were raised near the pond. The roof of the Thirty-Six Yuanyang Pavilion adopts an arch shape, which is curved and beautiful, covering the roof beams. It also uses this curved roof to reflect sound and enhance the acoustic effect, making the lingering sound linger around the beams.