Introduction to Feng Shui wall protection: According to Hakka Feng Shui, there must be a mountain (commonly known as "backer") behind the main ancestral hall. The function of the protection wall is to be the "backer" behind the ancestral hall ("to block the flow of wealth from flowing out"). The rockery Its shape is like a dragon's body, with a waterfall pouring down from it. On the protective wall, the unique Chinese character "福" (福) in Bailu, an ancient town in Gan County, is carved, showing strong local characteristics.