BS Johnson - Living by

Walking, snow falling, it is possible
to focus at various distances
in turn on separate flakes, sharply engage
the attention at several spatial points:
the nearer cold and more uncomfortable,
the farther distanced and almost pleasing.

Living, time passing, it is preferable
to focus the memory in turn upon
the more distant retrospects in order
that the present mind may retain its peace.

Yet knowing that seeing and remembering
are both of course personal illusions.

BS Johnson

http://www.poemhunter.com/poem/living-by/