If a performer has to hold a pleasant expression (often at the end of a production) to the point where it becomes forced, it will probably drift into a moire effect.

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The moiré effect refers to a visual perception that occurs when a set of lines or dots, superimposed on another set of lines or dots, creates a secondary, often wavy, pattern. It is not related to facial expressions or emotions.

If a Performer Has to Hold a Pleasant Expression (Often