The snake wandering in the ancestral grave shows that the descendants of this family have a prosperous career. Ancestral graves are called yin houses. Traditionally, yin houses are regarded as a treasure trove of geomantic omen, called "land of living dragons", which can bless the younger generation and developed descendants. "Lively Dragon Land" is surrounded by auspicious clouds all the year round. If the ancestors happen to be in "Lively Dragon Mouth", the descendants will be great.