What is six fires?

The human soul belongs to Yin, which is strong in water and weak in fire. The cloth method of the fire bureau is to carve twelve branches of the earth with six three-foot stones, namely, Ji, Wu, Wei, Hai, Zi and Ugly, and bury them around the tomb, including Ji, Wu and Ugly. In the "three meetings of the earth support", there will be a southern fire in the past, but not at noon; Hai, Zi and Ugly will have northern fire. These two fires are called "six fires" in Maoshan art.