Lyric discussion by bjort 

Cover art for Our Mother the Mountain lyrics by Townes Van Zandt

I think the lady represents temptation towards "sin", or something you want but you know you can't have hence, when he tries to touch her, the beauty she has turns into something ugly and dead and she vanishes. Hence "your first born will surly be blind" she curses him because he made a move towards her, showing that he's vulnerable towards "sin", with his first born being blind the child will not be able to see or know the difference between beauty and ugliness.

Yes this is a very haunting song especially the part : "I reach for her hand and her eyes turn to poison, and her flesh turns to brine, she leaps cross the room, she stands in the window and screams that my firstborn will surely be blind," its imagery that could have been taken from a nightmare. I also agree with everything bjort says but would like to add that I recall reading mythologist joseph campbell talk about a native american myth where a young man gives into temptation and then his lover turns into a snae

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