I think our ancestors discriminated between a polarity and a duality. A polarity admits all correspondences and is always a unity, like the earth with her poles, or a magnet. Day and night represent a unity. Waking and sleeping, inspiration and exhalation. Birth and death.

A duality does not admit all correspondences, and is an abstraction in which the unity is broken. This requires a third domain of unification which can only partly restore what cannot really be present in a duality.

We are trained to dualistic thinking; but our ancestors sensed the dangers of this intuitively; they were trained to polaristic thinking — which admits all correspondences… and thus carries and conveys domains of reference and meaning which are impossible to imply or transmit via dualities.