Jung interpreted the dream as affirming his emerging model of the psyche. The upper floor represents the conscious personality, the ground floor is the personal unconscious, and the deeper level is the collective unconscious – the primitive, shared aspect of psychic life. It contains what he came to call archetypes, the feature we shall turn to now. They are fundamental to Jung's psychology. Archetypes can be thought of simply as structuring principles. For example, falling in love is archetypal for human beings. Everyone does it, at least once, and although the pattern is common, each time it feels new and inimitable. Hence, Cleopatra was the lover of both Julius Caesar and Marc Antony, though Caesar fell in love with her when she appeared from the folds of a carpet, whereas what worked for Antony was her appearing resplendent in great state on a barge. "When an archetype is constellated, our whole body is engaged and its emotional arousal focuses and motivates us with a force that is very difficult to resist," writes John Ryan Haule.

Stefano Rocca Parmenides: Carl Jung, part 4: Do archetypes exist? Jung's the...: http://www.theguardian.com/commentisfree/belief/2011/jun/20/jung-archetypes-structuring-principles?guni=Article:in%20body%20link