Tradition sees the entire universe as consisting of the elements fire, air, water and earth. When we apply this system to personalities, the elements represent certain basic traits and give a certain “temperament”. This varies according to the emphasis of the elements in the horoscope. Any placement of planets or personal points in a sign constitutes an emphasis. The four elements can be regarded as four basic principles of life. These can be applied to all sorts of things through the principles of similarity and analogy. C.G. Jung has opened the door to a modern understanding of these categories by developing a system of types, in which the elements correspond to four basic functions of the psyche. The emphasis or non-emphasis of the elements in the individual horoscope reveals fundamental aspects of the personality.