 The higher part was supported by four gigantic trees, growing in each corner of the Tlalocán (the central part of the universe).Such imagery is also found in the idea of a world tree, such as Yggdrasil in Norse mythology, Jian Mu in Chinese mythology or the Ashvattha fig in Hindu mythology.These trees impeded the joining of the Overworld (the higher world) and the Underworld (the lower world) to Tlaltícpac (the earth).