the group of artists that called themselves 'Der Blaue Reiter' was situated in München, Germany. In contradiction to the wild artists of
Die Brücke, the members of Der Blaue Reiter were educated at an academic level. But, both groups rejected the academic traditions.
They rejected the traditions, not the academic principals.
Although these artists left the academic rules of art completely, their work was theoretical very well grounded. The artists of Der Blaue Reiter, August Macke, Franz Marc, believed that every person has an inner and an outer world. The art had to bring these worlds together. This difficult theory was created by Wassily Kandinsky, one of the most important artists of the group.
Simply said the theory means that the outer world of color and form brings you to the inner world, the feeling. It is just like in music, where the individual tones form a harmonious whole, which causes an certain inner feeling. Music is the evidence that a feeling is not only related to recognizable and understandable scenes.
By the use of this method, Kandinsky created the first completely abstract painting in history. The composition of color and forms are not related to the visible reality, but still causes a certain feeling.
This step meant a major change for art with its unknown possibilities.