Center of Gravity

In crowded bars, at subway cars
Whenever you are next to me,
Center of gravity,
Can't feel both feet on the ground
Walking home after dark, past the softball park
It's clear to me, according to a rule I learned one day in school
Basic geometry: two halves of a circle, you and me
It's a familial song we've known so long
Your clever cuts into me
As long as you're next to me
I can't feel both feet on the ground