Core Dynamic in Nature
A circle joins, and separates, and, therefore, is responsible for, any X and-or Y.
Yin and yang (ancient) is zero and one (modern) (circumference and diameter) (literally and figuratively).
Meaning 'two' is the minimum and the maximum (the only) number.
Known to all of us as 50-50 everything.
Complementarity is the basis for identity because duplicity is the basis for a unit because a simple circle is conserved.
Thus, Conservation of the Circle is the most important discovery, insight, oversight, and foresight, of all time, the Theory of Everything that explains and integrates (unifies) all disciplines.
More (in depth) (and most up-to-date) details at The (new) Circular Theory website here.