Faces are different. There are changes in the face help you understand shifting the emotions. Stoic faces behave different. And unfortunately, among the all, people who are saddest, have stoic face. I myself, can see a lot in this emoji : :| you know, there is something special in the eyes of this emoji. Cannot express it. We at "the stoics" are trying to share heart feeling of a stoic person. We hope this can bring a change, so the endeavor will be valuable.