The Norse World Tree or Yggdrasil is depicted with Odin sacrificing himself as an initiation into the Mysteries as referenced in the Havamal. Above him Ratatosk, the squirrel ferries insults between Niddhogg the dragon, the force of destruction in the tree's roots and the Eagle who represents the highest spiritual light. The three Norns are seen as Past, Present and Future as they constantly pour healing waters on the tree's roots to heal the damage of Niddhogg. Below them sits Hel in the Underworld flanked by Asgard with its Rainbow Bridge and Jotunheim with Mimir's head.