I've always thought about how much simpler the world would be if people communicated with feelings as opposed to words and gestures. If we could see what one person was feeling and know hostility, happiness, anger, sadness, confusion, whether they were nervous or not. . . But we don't, thus the world is much more complicated.
People can lie to your face and you may not even suspect a thing. There could be a person crying but no evidence on the outside to show it. Instead we have masks that let us conceal certain things about us and just makes everything so much more difficult to deal with.