This chapter focuses on Jung's major and lasting contribution to the psychology of consciousness, which is largely embodied or contained in his work entitled Psychological Types. Such as Extroverted thinking types, if this is their superior function, tend to elevate objective thinking into the ruling passion of their lives. Just as the extroverted thinking type tends to reach out into the world, the introverted thinking types tend to use their superior function to analyse the world. Extroverted feeling types are apt to be capricious, as feelings change as often as situations. Unlike their extroverted twin, introverted feeling types tend to keep their feelings hidden, are silent, inaccessible and often display melancholy or depression. Like all introverts, introverted sensation types stand aloof, since their psychic energy is directed inwards towards the inner world rather than out towards the outer reality. Introverted intuitive types are most clearly seen in the stereotype of the artist, the dreamer, the visionary, the prophet.