Two marbles roll down a plank of wood
they begin close, but without contact
the marbles roll down, opposite directions
all of a sudden the wind changes
they roll side by side scraping each other
a knot, they separate, continuing, both going the same direction
in different paths
their paths never cross again,
they both end up at the bottom of the plank individually
but without that period of togetherness,
without their paths having crossed
they would be where they were.