One that appears when people want to cover their many kinds of expressions, as they feel neither happiness nor joy, does not have the factor that muscle around the eyes is strained. In Japan, this kind of smile is used as a sign of consent by subordinates to orders or suggestions from their bosses. They might feel anger or scorn to the boss, but since they are not allowed to show negative emotions, they usually cover these sorts of emotions by smiling. The smile showing sociableness and obedience does not go with the movement of muscle around the eyes. Smiling is one of expressions that can be shown easily while there are some expressions that cannot be shown intentionally like fear.
People smile by pulling up both sides of the mouth moving muscle connecting to the cheekbone.
It can be moved easily by anybody and the smiling changes diversely depending on how it is moved. Therefore smiling can tell various kinds of emotions. Principle and practice It is often said that Japanese people's speech and action do not always show what they feel and think frankly. They are so clever that they change their manner of speaking between principle, speech and action that suit the occasion in public as a circle of people and practice, the true feeling hidden behind the principle. It is thought to be natural for Japanese to do so.