The person is divided into two parts: basic instincts - animal(the left small arc) and spirit - soul(the right small arc). The human basic instincts part is the same as in any other animals - they want to eat, to breed and to be safe. The spirit part is what makes us different from the animal world. This is logic and abstract thinking.It let us observe and conclude.A mix of these two building blocks gives us the universe of personalities, characters, feelings and behaviors. This is the third big arc. That arc lets people do almost anything they can think of.