In 1981, two Disney animators named Frank Thomas and Ollie Johnston published what has since been called the "Bible of Animation" — a book called The Illusion of Life: Disney Animation. In it, they laid out 12 foundational principles that govern how great animation moves. Voice actors, they are NOT just for animators. Puppeteers, you need to take note too. Here's why — and what each principle means for the performance you bring to the mic and beyond.