What concept was outlined by Disney animators Thomas and Johnston in their book "The Illusion of Life"?

The concept outlined by Disney animators Thomas and Johnston in their book "The Illusion of Life" refers to the 12 Key Animation Principles. This foundational work introduces these principles as essential guidelines that enhance the realism and emotional engagement in animation. The principles, such as squash and stretch, anticipation, and exaggeration, are designed to create more believable movements and character expressions, ultimately leading to a more immersive viewing experience.

The importance of these principles lies in their universal applicability across various styles of animation, making them vital for both classic hand-drawn animation and modern digital techniques. Thomas and Johnston's emphasis on these principles significantly shaped the standards of animation quality and creativity in the industry, influencing countless animators in their storytelling process.