This might be something no one cares about anymore, but Yggdrasil is an Ash Tree that splits into every known reality and the house is on Ash Tree Lane so it does actually have a pretty constant and repeated reference throughout the book.


The World Ash Tree of Norse mythology translates to "Odin's Steed". "Ygg" in turn translates to "terrible one". Odin hung himself for nine days on the tree in order to acquire knowledge of the runic alphabet. You can read more about it here. This echoes Navidson descending into the House to tackle his personal demons, which ...

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