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Memoirs of a Lucid Dreaming Practitioner. Part V
The bridge embodies connection between Heaven and Earth, the union of a man and a deity. It is a form of a bond between different points of sacred space. The bridge has always meant a transition from one state to another, a change or a desire for a change.
Earth and Heaven were once connected by a bridge (or a tree, or a vine), and thanks to this people could easily communicate with gods, because there was no death. Since then the connection between Earth and Heaven has been lost, so you can only cross the bridge as a “spirit”. For that you have to either die, or to enter a trance state. This transition is rather hard to achieve, as it is fraught with dangerous obstacles and not all of the souls are capable of overcoming it.