text: Professer Nibu said the process begins when the computer construts a 3-D computer model of the face; all 44 major muscles in the model must move like human muscles. Movement of one or more muscles is called an "action unit. Then his friend Dr. Huang relies on the work of psychologists such as Dr. Paul Eckman, the creator of FAC (Facial Action Coding). Dr Huang then observed that "The facial expressions for each emotion are universal, even though individuals often show varying degrees of expression."