This is another one of those poems about one small thing the way stones in a field get scratched by farm equipment.
Tillage Marks
On this flat stone,
too heavy for one man alone
to pick up and carry
to the edge of his field,
are the faint white marks
of a plow, one plow
or many, the sharp blade
crisscrossing its face
like a lesson scratched there
in chalk, the same lesson
taught over and over,
to one man alone in his field
for fifty or sixty years,
or to fifty such men,
each alone, each plow striking
this stone, in this field
which he thought to be his.