The tree figures in the mythologies of pre-Columbian Mesoamerican cultures, in particular that of the Maya civilization, where the concept of the central world tree is often depicted as a Ceiba trunk, which connects the planes of the Underworld (Xibalba), the terrestrial realm and the skies. The unmistakable thick conical thorns in clusters on the trunk were reproduced by the southern lowland Maya of the Classical Period on cylindrical ceramic burial urns or incense holders. Modern Maya still often respectfully leave the tree standing when harvesting forest timber.[2] The world tree is a motif present in several religions and mythologies, particularly Indo-European religions, Siberian religions, and Native American religions. The world tree is represented as a colossal tree which supports the heavens, thereby connecting the heavens, the earth, and, through its roots, the underground. It may also be strongly connected to the motif of the tree of life. Specific world trees include the one in Hungarian mythology, Yggdrasil (or Irminsul) in Germanic (including Norse) mythology, the Oak in Slavic and Finnish mythology, and in Hinduism the Ashvattha (a Sacred Fig).