Dream—
--Elizabeth Bishop 

I see a postman everywhere
Vanishing in thin blue air
A mammoth letter in his hand,
Postmarked from a foreign land. 

The postman's uniform is blue.
The letter is of course from you
And I'd be able to read, I hope,
My own name on the envelope 

But he has trouble with this letter
Which constantly grows bigger & bigger
And over and over with a stare,
He vanishes in blue, blue air.