Analysis of Bipolar

The name means two poles.
North and south?
Which end is up?
Two poles.
One tall, thin, and trembling,
On which I must balance,
Twirling like a plate on a stick.
From up here, I can see everything I want,
So high that I have to look down through clouds.
But I am afraid of heights.
The other pole is short, thick, comforting.
It has a broad base, sturdy.
The weight of the world rests upon it.
From under it, I see nothing,
Just the warm, dark earth.
There must be a place in the middle,
Not scary and high,
Not low enough to be buried.
I can't rember the middle any more,
But it must be there. It must be.