A folk saying goes: "One look expresses more than a thousand words." Psychologists believe that the eyes are the "window" to the soul. They can be used as a weapon to make people feel timid and fear. Common pupil language shows that when expressing aversion and hatred, the pupils constrict and reveal a piercing gaze. On the contrary, wide-open eyes indicate sympathy and great interest, as well as agreement and favor. Besides revealing the relationship between superior and subordinate, power and dependence, eye contact can also disclose much more.