The theatrical Baroque mode was often adopted for works of art commissioned by proponents of the Counter-Reformation in Italy. Using Bernini’s design of the Cornaro Chapel with the altarpiece "Ecstasy of Saint Teresa" and Gaulli’s "Triumph of the Name of Jesus" point out the key or common features of this stylistic mode, how this stylistic mode engages the viewer, and how it conveys the spiritual message of the religious reformers.

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To identify the key or common features of the theatrical Baroque mode in the artworks mentioned, it is essential to analyze Bernini's design of the Cornaro Chapel with the altarpiece "Ecstasy of Saint Teresa" and Gaulli's "Triumph of the Name of Jesus." Let's break it down:

1. Key/ Common Features of the Theatrical Baroque Mode:
a. Dramatic Use of Light and Shadow: The theatrical Baroque mode often employs a strong contrast of light and shadow, known as chiaroscuro, to create a sense of drama and impact. This technique can be observed in both artworks, highlighting key elements and creating a heightened emotional effect.

b. Dynamic Movement and Gesture: The style of the Baroque period frequently incorporates dynamic and exaggerated movement, portraying figures in dramatic poses that engage the viewer. Both Bernini and Gaulli utilize this element, capturing the energy and intensity of the scenes depicted.

c. Illusion of Depth and Space: Baroque artists sought to create a sense of depth and space, often by employing techniques such as foreshortening and trompe l'oeil (a visual trickery giving the illusion of three-dimensional elements). These techniques can be observed in both artworks, immersing the viewer in the scene and enhancing the overall theatrical experience.

2. Engaging the Viewer:
The theatrical Baroque mode aims to captivate the viewer by creating immersive and visually striking compositions. In both artworks mentioned:
a. Dynamic Poses: The figures are depicted in dynamic and expressive poses, inviting the viewer to engage and connect emotionally with the scene.

b. Intense Emotions: The use of dramatic gestures, expression, and lighting generates intense emotions in the viewer, stimulating their senses and drawing them into the artwork.

c. Monumental Scale: The grand scale of these artworks, as seen in the large size of the installations and the imposing presence of the figures, further engages the viewer, making them feel a part of the scene.

3. Conveying the Spiritual Message:
The theatrical Baroque mode was particularly effective in conveying the spiritual message of the Counter-Reformation by:
a. Eliciting Emotional Response: The intense emotions portrayed in both artworks, such as ecstasy, awe, and triumph, aim to evoke a powerful spiritual response from the viewer, inspiring devotion and deepening their connection to the religious message.

b. Creating a Theatrical Experience: The use of dramatic lighting, dynamism, and illusion of depth helps create a sense of the miraculous and the divine in these artworks. The viewer is encouraged to experience the spiritual narrative in a visceral, tangible way.

c. Highlighting Divine Intervention: Through the dynamic compositions and dramatic gestures, the artworks emphasize the intervention of the divine in human affairs, reinforcing the power and significance of religious reform.

By analyzing these key features, the viewer can better understand how the theatrical Baroque mode engages the audience and conveys the spiritual message intended by the religious reformers of the Counter-Reformation in Italy.