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For the comic / marvel fans I'd like to show another example, which you may understand better.
The world tree "Yggdrasill" connects the nine worlds in Thor.
http://marvel.wikia.com/wiki/Yggdrasill

Great example. I wrote on that tree in my main blog a while back also. I just posted it up here. https://steemit.com/history/@thewildchiro/spine-as-symbol-in-the-ancient-world-vikings-the-spine-as-the-world-tree

Hi! I am a robot. I just upvoted you! I found similar content that readers might be interested in:
http://thewildchiro.com/2018/06/spine-as-world-tree/