To slip into your shadow under cover of night.
To follow your footsteps, your shadow at the window.
That shadow at the window is you and no one else;
it's you.
Do not open that window behind whose curtains you're moving.
Shut your eyes.
I'd like to shut them with my lips.
But the window opens and the breeze, the breeze
which strangely balances flame and flag surrounds my escape
with its cloak.
The window opens: it's not you.
I knew it all along.

Robert Desnos

http://www.poemhunter.com/poem/under-cover-of-night/