This shows symmetry. Our faces can reveal many different emotions. Sometimes people show a different emotion on their face than they feel inside. This is one example of a mask. Another example of a mask is one used for costume.
People can put on a mask and become someone or something different than their normal self.
Make-up could even be considered a type of mask. 3.create a mask incorporating pattern and texture. Many different cultures have used masks. Some cultures use masks to frighten away evil spirits. Other cultures might use masks ritualistically, perhaps to provide luck for a good hunt.