She’ ll smile to you if you move to the left. No, try a different angle. I don’t know… Is she smiling at all? For over 500 years, viewers and researchers have been trying to interpret Mona Lisa’s enigmatic smile. If a half-smile is worth that much attention, that says a lot about the importance of emotions. And maybe even more about the difficulty of their detection.

Internet users, having to deal with the lack of face-to-face interaction and the frequency of misinterpretation, started to convey their feelings with emoticons.