These are thoughts, emotions, and personality matrices that are below the level of conscious awareness. Reversals are metaphors and shortened sentences. The third level he describes as the collective unconscious. These are a variety of patterns and issues from the core of our being. Reversals are archetypes, strong metaphors, and occasionally old styled English language, such as King James.
Metaphors are symbolic words.
Some have universal meanings in Reverse Speech and others are representational to the individual only. The key to their interpretation lies within the complementarity features between the forward and reverse dialogue. They are more universal in their significance and stem from deeper parts of our psyche, possibly the collective unconscious as detailed by Carl Jung. They use words that contain strong religious or mythological symbolism and tend to contain more life that metaphors which are primarily static in their nature. Archetypes give the impression of a live drama being re-enacted in the depths of the mind.