Introduction to Huanyun Rockery: Huanyun Rockery is located in the north of Deyue Tower. It was built with Taihu stones when Yuyuan Garden was renovated in 1986. There is a flowing stone path in the mountain, which winds up along the mountain range. There is a clear spring in the cave, and you can faintly hear the sound of the spring water from the moon tower. Chen Congzhou inscribed "Huanyun".