When a poet uses a metaphor in a poem, what is he or she saying? That two things are really different and have little in common.
That something is so different from anything else that it's unique.
That one thing is so much like another that it IS that other thing.
That something is a little bit like something else.

i don't see anything attached can you attach something?

"valley of salt tears" and "dark, deep and foggy" are two images used to establish a mood of uncertainty and regret. this imagery is made up of sensory appeals to brings up   theological concerns of sin and retribution.

they conjure up the human   uncertainty about the divine and its relationship to the world.