We keep the wall between us as we go.
to each the boulders that have fallen to each.
and some are loaves and some so nearly balls
we have to use a spell to make them balance:
"stay where you are until our backs are turned! "
we wear our fingers rough with handling them.
oh, just another kind of out-door game,
one on a side. it comes to little more:
there where it is we do not need the wall:
he is all pine and i am apple orchard.

what does the line “and some are loaves and some so nearly balls” refer to?