"The imagery along the sides, between his body and the feathers of his backrack, reinterate the themes of resurrection and fertility. Twisted cords of the cosmic umbilicus rise from the inside of a hollow glyph reading sak, 'white,' because the umbilicus carries the kind of soul the Maya called sak nik, 'white flower.' The white signs hold wayob, 'animal-spirit companions,' conjured from the Otherworld. Square-nosed serpents with glyphs for 'white flower' attached to their noses terminate the twisted cords. These 'white flower' signs refer both to the flowers that grow on the branches of the Wakah-Kan World Tree and to the human soul, because we humans are like the flowers of this tree. Clinging to the twisted cords like monkeys are four Maize Gods."
Linda Schele & Peter Mathews, The Code of Kings: The Language of Seven Sacred Maya Temples and Tombs, p. 154-55