An Opposite (n.) can stand in for every element of a dream as easily as the element itself, and only context decides — which is why dream-books have always read by contraries.
An Opposite (n.) lies very close to its word in our linguistic consciousness, so the wrong one is easily evoked.
A Opposite (n.) lies closest to hand: the commonest slip says the exact opposite of what was meant, because opposites are near kin in the mind.
Opposite (n.) live comfortably side by side in the unconscious without dispute, and often enough in consciousness too.
Opposite (n.) that consciousness keeps apart, mother and prostitute, are often one in the unconscious.
Opposite (n.) expressed by one and the same element are an archaic habit of thought, shared by dreams and the oldest languages.