it operates like a glass ceiling
But is more often self- constricted.
It can come in a set;
One inside the other,
Inside another.

Some people are able to move
From the smaller to the larger.
There are no hinged sides
And any movement will cause shattering of glass
And sharp edges.

Sometimes after a breakthrough others follow.
They can see the shards of glass
And avoid them.

At first the glass sides are clean and clear
But they become clouded
By those breathing the stultifying air.

Those who grow inside the box
Become distorted
By its restrictions
And find their faces flattened against its sides.

Sometimes the box is a lonely place to be.

For those who leave
There's no return.

The air outside the box is rarified
And keeps one
gasping.