Apprehensions Sylvia Plath

There is this white wall, above which the sky creates itself---
Infinite, green, utterly untouchable.
Angels swim in it, and the stars, in indifference also.
They are my medium.
The sun dissolves on this wall, bleeding its lights.

A gray wall now, clawed and bloody.
Is there no way out of the mind?
Steps at my back spiral into a well.
There are no trees or birds in this world,
There is only sourness.

This red wall winces continually :
A red fist, opening and closing,
Two gray, papery bags---
This is what I am made of , this and a terror
Of being wheeled off under crosses and a rain of pietas.

On a black wall, unidentifiable birds
Swivel thier heads and cry.
There is no talk of immortality among these!
Cold blanks approach us :
They move in a hurry.