hi claudia,
the law of opposites, or the law of two as it has been called can be very profound in its ramifications.

at this level of equal and apparent opposites (a study in itself) for the two opposite forces to meet would be destructive and very unstable therefore it finds a third vector to unite but seperate the two.

this can be anything from a neutral wire in a plug to what seperates and binds a man and a woman.

respects
gryphon