Unity of opposites is the central category of dialectics, and it is viewed sometimes as a metaphysical concept, a philosophical concept or a scientific concept. (Coincidentia Oppositorum).
"The road uphill and the road downhill are one and the same" (Heraclitus).
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Heraclitus' flux doctrine is a special case of the unity of opposites, pointing to ways things are both the same and not the same over time. He depicts two key opposites that are interconnected, but not identical.