Back in the '30s, two Disney heavy weights created the 12 basic principles of animation. As part of Disney's "nine old men," Frank Thompson and Ollie Johnson were experts in the field and had as good a grasp on what made cartoons realistic as anyone alive today. And this video, made by Cento Lodigiani, does a fantastic job of simply demonstrating those 12 principles at work. Take a look for yourself and see how animators manage to craft such elaborate illusions with little more than artistic skill and their imagination.