There is an old saying, life, old age, sickness and death, buried in the earth. There are many ways of burial. Tibetan sky burial, water burial, cremation, earth burial, tower burial... Hanging coffin burial, tree burial, and boat coffin burial of southern minorities... … Throughout the ages, there have been countless burial methods, from the first to let the deceased rest in peace, and then to the descendants of Yize. Now, except for some ethnic minorities who still maintain special burial methods, even burial has almost disappeared. All were replaced by cremation. I have been to many places, saw many dead people, and carried countless coffins in my life.