Because we "live facing the south", Feng Shui often uses green dragon, white tiger, red bird, and Xuanwu to represent the direction. For example, "The Book of Burial" says: "The left is the green dragon, the right is the white tiger, the front is the red bird, and the back is the Xuanwu." "Ten Books on Yangzhai" says: "Any house with running water on the left is called a green dragon; a long road on the right is called a green dragon." The white tiger; the sweat pool in front, is called Zhuque; the hills behind are called Xuanwu, which is the most precious place." Therefore, Qinglong, White Tiger, Zhuque, and Xuanwu became the names of the four gods respected in Feng Shui.
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