1. The "Tang" in this proverb refers to Tang Ming, which is an ancient term used to look at geomantic omen, and refers to the so-called place where the earth and air meet in front of the tomb. In geomantic omen, sand usually refers to mountains, with dragon and tiger sand around Dongting, dragon sand on the left and tiger sand on the right. White tiger wearing a hall means that the tiger sand is too long to pass through the front hall, which is the most taboo.
2. According to Feng Shui theory, the best cemetery pattern is that dragons, tigers and sands embrace each other, helping each other on behalf of brothers and sisters, and being rich and healthy. Under normal circumstances, tiger sand can't be longer than or higher than dragon sand. Dragon tiger is the abbreviation of auspiciousness, and dragon tiger is the abbreviation of evil, so there is a saying that "a white tiger wears a hall, and the family is ruined."