The
Composition
Form
Perspective
Light
Color
Proportion
http://www.arts.rpi.edu/~ruiz/Lessons/lesson5proportion/Proportion.htm
Motion
http://www.arts.rpi.edu/~ruiz/lessons/lesson4motion/Motion.htm
the myths of persistence of vision
http://www.privatelessons.net/2d/sample/m01_03.html
http://www.wikipedia.org/wiki/Animation