The manifestation of emotions using nonverbal signals can positively affect the working environment.

Firstly, a clear demonstration of feelings of one of my colleagues can cause a chain reaction. In this scenario, a positive attitude employee transferred the rest, which improves workflow efficiency.
Second, emotional displays can serve as a barometer of the collective. For example, if one of the employees left the office of the chief angry or frustrated, for the rest it will be a signal not to disturb the boss at the moment, which, in turn, will avoid unnecessary conflicts.
Of course, the work requires concentration and endurance, but that does not mean that you should completely hide emotions.
Trying to keep a good face on a bad game will be regarded more as colleagues insincerity. The trick is that the more a person hides emotions, the higher the probability that they will leak through small, almost indiscernible expression. And it is they believe colleagues.
In addition, the need to always keep a person very exhausting. That is why talking about exhausting "emotional labor" staff.
In any case, when you realize that feeling, and it manifests itself adequately, the atmosphere around becomes more favorable.