Thx @reinhard-schmid.
About the non-realistic art styles and movements, I think it is even more a matter of control (and a matter of learning by narrative and non-verbal patterns). I'll write a post about it.
Same thing about surrealistic images: the simple fact to create images out of inner feelings and concepts makes them visible, not in the darkness anymore. Images are a powerful way to tame the unspeakable :)