DREAM by 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 constatnly grows bigger &bigger
And over and over with a stare,
He vanishes in blue, blue air.