Universal Seesaw
(courtesy University of Science and Philosophy)
(click to enlarge)

Russell
"Every effect of motion thus results in the production of the opposite effect, therefore the negative reaction which results in the disappearance of the electron is accompanied by its equal and opposite action which causes the reappearance of the mass by the reverse action of the "hole"." [Cycle of Motion]

"Every opposite of every pair is born, and becomes its opposite sequentially." [Atomic Suicide, page 234]

See Also

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electric action-reaction
equal opposition of force
Father-Mother
Figure 3.5 - Conflicting and Opposing Vector Potentials
Figure 8.8 - Polar States or Conditions as Seeming Opposites
mate-pairs
Polar
production of the opposite effect
rhythmical interplay
Reciprocal
Seesaw
Sex