Hard Place

When talking rock and hard place, it would seem,
we tend to focus solely on between.
It is, of course, a common enough theme:
imagine, if you will, this type of scene:
A rock is on the left, you're in the middle,
and to the right of you, you see a... wait...
What kind of place, exactly? For that riddle,
an idiom for railing at your fate,
we've picked two things, but one's unlike the other.
One conjures up an image, crystal clear,
but opposite it, an unknown. I'd rather
have something more concrete to hate, to fear...
Make your hard place a wall, that'll do the trick.
A wall you can dismantle, brick by brick.