Gold pectoral showing the order of the universe from Tomb 7 at Monte Alban. Museum of Cultures of Oaxaca, Oaxaca, Mexico. From top to bottom, the ballcourt represents the sky, the place of cosmic battle between day and night; the sun disk is day; the flin

Gold pectoral showing the order of the universe from Tomb 7 at Monte Alban. Museum of Cultures of Oaxaca, Oaxaca, Mexico. From top to bottom, the ballcourt represents the sky, the place of cosmic battle between day and night; the sun disk is day; the flint knife is the moon and night, and the monster with gaping jaws, the earth. Late Postclassic Period, 1250 - 1521 A.D. (Photo by: Jon G. Fuller/VWPics/Universal Images Group via Getty Images)