Ceiba, the sacred tree
A tree with a tall, strong trunk that is common in Yucatan connects with the three levels of the universe. Its leaves touch the skies, the body connects to the earth, and its roots get into the ground until touching the water.
The Popol Vuh
The sacred book that encloses mystical stories of the Maya mythology, including a Xibalbá description and the gods that inhabit there.