Wall

A wall is a thing you hit when you've worked too long or too late or too hard.
 
A wall is a thing you climb when you're frustrated with where you are, what you're doing, what's happening around you.
 
A wall is a thing you scribble on when it seems as though that's the best place for people to notice what you have to say
 
A wall is a thing that separates you if you can't get over, around, or through it.
 
A wall is a thing that keeps you safe when you can't bear the thought of people intruding upon your peace, your quiet, your world.
 
A wall is a thing you scale when you can just tell that there is something different, something exciting, something better on the other side.