Unity of opposites

The unity of opposites (Latin; unio oppositorum) is the central category of dialectics, said to be related to the notion of non-duality in a deep sense.^[1] It defines a situation in which the existence or identity of a thing (or situation) depends on the co-existence of at least two conditions which are opposite to each other, yet dependent on each other and presupposing each other, within a field of tension.