Split the universe into two parts, in matter and the empty vacuum en place these two opposite to each other. This way the whole universe becomes one big polarity between matter and the vacuum.
The difference causes tension and this tension you find back in all the physical laws.
This is Grand Unification, science didn’t know what caused the tension. They didn’t see that matter stands in difference to the vacuum, or the Higgs field as they call it now.
Simple difference between two things that cover all unifies physics.
Grand Unification done.