weighty matters

to mediate all gravity's effects
a particle from mass must perturb all
not merely when they're close enough for sex
or ev'ry time that apples chance to fall
and Symmetry allows its Anti-, too
repelling what it can't annihilate
a counterpart to Kepler's cosmic glue
imbuing everything with mass with weight
or spacetime may just dimple where there's mass
to act on passing light as would a  lens
like cushions take the imprint of an ass
our ref'rence frame itself is that which bends
refining how the universe behaves
our gravity equations may need waves