There is wood with green leaves and purple stems, Xuanhua and yellow solids, and it is called Jianmu.There are no branches in the hundred ridges, but there are nine vines and nine walnuts underneath.This is a giant tree at the center of the world at the beginning of the world.The ancient book "The Book of Mountains and Seas" describes in detail its roots, which are twisted and intertwined, and its slender trunk penetrates into the sky. There are no branches on both sides. Only the top of the tree has some winding branches, which are coiled up.Like an umbrella, the emperors of all directions ascended and descended from it. This is the legendary road to heaven.