There are three main parts that are a part of the Aztec world which are “the earth world on which humans lived, an underworld which belonged to the dead and the upper plane in the sky.” The earth and the underworld were both open for humans to enter, whereas the upper plane in the sky was impenetrable to humans. The Aztec underworld was knowns as Mictlan, meaning place of death. As the sun was believed to dwell in the underworld at night to rise reborn in the morning, and the maize kernels were entered later to sprout anew, so the human and divine existence was envisioned as being cyclical. The upper and nether worlds were both thought to be layered so Mictlan had nine layers which were inhabited by different deities and mythical beings. The