The Long Jog:

Running, head down,
a world goes past unseen.
Breathe...Breathe...Breathe....

A long run --
one sidewalk block, so many
landscapes.

A long long run,
just beyond a worm's horizon,
the next stride.

A long run.
I slow to a walk. The world
of trees comes back.

When running, one is apt not to pay much attention to the surroundings, instead focusing in upon the body's exertions. But late in a very long run, one may become very aware of surroundings - micro-surroundings, such as the distance from one sidewalk block (or square of concrete - called a "sett", some dictionary or crossword puzzle told me once) to the next. It becomes easier to understand what an earthworm's horizon might be, if he were stranded on the sidewalk.