Why did greek masks have a large opening where their mouth was?

Greek masks featured large openings for the mouth to enhance the actor's vocal projection, allowing their voices to carry over larger distances in outdoor theaters. This design also enabled exaggerated facial expressions, making it easier for audiences to interpret emotions from afar. Additionally, the large mouth openings facilitated the use of various sound amplification techniques, such as the resonating properties of the masks. Overall, these features contributed to the theatrical experience in ancient Greek performances.