The face of the rulers, when they died, was covered with a jade mask, a symbol of power, immortality and fertility, to replace the mortal face with a perpetual portrait that preserve its spirit (pixan). This mask presents the ruler as a shaman for the scarifications on the sides of the mouth, and for the eyes on his forehead, of supernatural vision. The three pieces of green stone covered the pelvic area, with incised glyphs; whose most recent interpretations is "he came to the dark with his pectoral, for the first darkness emanated from heaven."