text: Also, most of these type tehnologies are useful mainly at expensive images such as Mona Lisa portrait. This type of system only helps solve the mysteries behind old images such as Mona Lisa and not students' emotions. The author reveals that. "The Mona Lisa demonstration is really intended to bring a smile to your face, while it shows just how much this computer can do." (D'Alto 6) This shows that the Facial Action Coding System is mainly useful for such mystery portraits. It only helps solve people's curiosity rather than help students in classrooms.