Loving a shadow

"(...)
Like a troop of travelling actors dressed to play Hamlet,
The evening shadows come.
They spend their days hidden in the trees
Outside the old courthouse.

Now comes the hard part:
What to do whit the stones in the graveyard?
The sun doesn't care for ambiguities,
But I do. I open my door and let them in."

From "Shading Exercise" by Charles Simic
collection "Club Midnight"
(Adelphi - Piccola Biblioteca 575 - 2008)