Lawrence Ferlinghetti - The Changing Light

The changing light
                 at San Francisco
       is none of your East Coast light
                none of your
                            pearly light of Paris
The light of San Francisco
                        is a sea light
                                       an island light
And the light of fog
                   blanketing the hills
          drifting in at night
                      through the Golden Gate
                                       to lie on the city at dawn
And then the halcyon late mornings
       after the fog burns off
            and the sun paints white houses
                                    with the sea light of Greece
                 with sharp clean shadows
                       making the town look like
                                it had just been painted

But the wind comes up at four o'clock
                                     sweeping the hills

And then the veil of light of early evening

And then another scrim
                  when the new night fog
                                        floats in
And in that vale of light
                      the city drifts
                                    anchorless upon the ocean

Lawrence Ferlinghetti

http://www.poemhunter.com/poem/the-changing-light/