What style of animation did John Bray contribute significantly to?

John Bray made significant contributions to traditional animation, particularly in the early 20th century. He was a pioneer in the field, developing techniques that streamlined the animation process, which enhanced the production efficiency of animated films. Bray's approach helped to establish many of the foundational practices of hand-drawn animation, such as the use of cel animation, where characters were drawn on transparent sheets to allow for easier layering and movement. His innovations not only improved the quality of animation but also paved the way for future developments in the industry, establishing a framework that would be built upon by later animators. This deep involvement with traditional animation underscores his lasting influence on the art form, making it the correct choice regarding his contributions.