the pleural cavity is a potential space
might it someday fill
with serum? or lymph?

the pericardial sac is a potential space
might it someday bulge
with blood? or pus?

you and i form a potential space

might we someday effuse boredom?
exude malignant bitter thoughts?
tamponade from pent-up frustration?
erupt with silent purulent rage?

or like the linings of the lungs
gently pull each other close
bound together by
an almost
imperceptible
vacuum?