Through that window—all else being extinct
Except itself and me—I saw the struggle
Of darkness against darkness. Within the room
It turned and turned, dived downward. Then I saw
How order might—if chaos wished—become:
And saw the darkness crush upon itself,
Contracting powerfully; it was as if
It killed itself, slowly: and with much pain.
Pain. The scene was pain, and nothing but pain.
What else, when chaos draws all forces inward
To shape a single leaf? . . .
For the leaf came
Alone and shining in the empty room;
After a while the twig shot downward from it;
And from the twig a bough; and then the trunk,
Massive and coarse; and last the one black root.
The black root cracked the walls. Boughs burst
the window:
The great tree took possession.
Tree of trees!
Remember (when time comes) how chaos died
To shape the shining leaf. Then turn, have courage,
Wrap arms and roots together, be convulsed
With grief, and bring back chaos out of shape.
I will be watching then as I watch now.
I will praise darkness now, but then the leaf.

Conrad Potter Aiken

http://www.poemhunter.com/poem/the-room-2/