Build your tether rain-out from your fragments
Break the sailor’s table on your sacrum
Fuck the fiercest fables, I’m with Hagen

from Bon Iver – Towers Lyrics on Rap Genius

Meaning

It easy to go along cross reference from sacrum (A triangular bone in the lower back situated between the two hipbones of the pelvis) to sacral chakra (Located about two inches below the belly button, associated with emotions, sex and manifestation) being the balance of our emotions.

Therefore, these lines portray the falling to pieces of her innocent and peaceful veneer (A thin decorative covering of fine wood applied to a coarser wood or other material) accepting the cascading of her idealistic views to acknowledge the real world, that love comes with a range of emotions that need to be balanced.

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