August Macke was one of the leading members of the German Expressionist group Der Blaue Reiter. He lived during a particularly innovative time for German art: he saw the development of the main German Expressionist movements as well as the arrival of the successive avant-garde movements which were forming in the rest of Europe. Like a true artist of his time, Macke knew how to integrate into his painting the elements of the avant-garde which most interested him.

https://en.wikipedia.org/wiki/August_Macke