What is the Delsarte System of Expression primarily known for?

The Delsarte System of Expression is primarily known for its focus on communication through gestures. Developed by Francois Delsarte in the 19th century, this system emphasizes the use of body language and physical movements to convey emotions and ideas. Delsarte believed that specific gestures could express particular feelings, allowing performers to communicate more effectively with their audience without the use of words.

By studying the relationships between emotions, gestures, and physical expressions, artists can enhance their ability to portray characters and evoke responses from viewers. This approach serves as a foundation for various theatrical methods and forms, highlighting the significance of non-verbal communication in performance.

As for the other choices, while improvisational techniques, voice training, and physical theater are important aspects of performance arts, they do not specifically capture the essence of the Delsarte System, which is uniquely centered around the expressive capabilities of gesture and physicality in conveying meaning.