Introduction to Tongtian Pillars: There are 16 main pillars in the Wanjuan Tower, all of which are wooden pillars that reach the sky. The 16 pillars reflect the legend of the nine brothers who opened the sky and the seven sisters who split the earth in the Dongba hieroglyphics of the Naxi people. According to the story, the column is 22 meters long, which is the folk meaning of double days for good luck and good things.