text: This computer software works with emotion algorithms. According to the passage, "The process begins when the computer constructs a 3-D computer model of the face; all 44 major muscles in the model must move like human muscles." Mona Lisa, Leonardo da Vinci's Renaissance painting, was tested with this software. A recent study shows that Mona Lisa is 83 percent happy, 9 percent disgusted, 6 percent fearful, 2 percent angry. The Facial Action Coding System uses video imagery, the new emotion-recognition software tracks these facial movements. The text also states that this software can even identify mixed emotions.