When I say this, I actually mean this

It's official. Mona Lisa was 83% happy, 9% disgusted, 6% fearful and 2% angry. Thus concluded a university of amsterdam computer that applied emotion recognition software to leanardo da vinci's work on the famous enigmatic smile. The algorithm, developed in conjunction with the university of illinois tries to assess the human mood by examining key features such as the curvature of the lips and crinkles around the eyes, then makes a score with respect to six basic emotions.

Scientists drew on a database of young female faces to derive an average "neutral" expression, which the software used as a standard to compare the painting against.