"Sishanhai Xiangyin belongs to wood" means describing a Feng Shui concept. In Chinese Feng Shui, elements such as direction, terrain, and the five elements are considered to have an important influence on a person's fortune. "Sishan" refers to the orientation from south to north, while "Hai Xiang" refers to the orientation from northwest to southeast. This is based on the corresponding relationship between the twelve earthly branches and orientations. In this context, "Sishanhai direction" can be understood as the direction of sitting south and facing north and west. As for "Yin belongs to wood", this describes the attributes of the five elements. "Sishanhai Xiangyin belongs to wood" means describing a Feng Shui concept.