The artists’ group “Die Blaue Vier” (The Blue Four) was an influential association of four outstanding Expressionist artists: Wassily Kandinsky, Lyonel Feininger, Paul Klee and Alexej von Jawlensky. The group was founded in Weimar in 1924. Already before the war, all artists had participated in exhibition activities of the artists’ association “Der Blaue Reiter”, which is commemorated through its name. The idea for the formation came from Galka Scheyer, a New York-based art dealer of Russian origin. She organised several exhibitions in the USA hoping to establish the artists on the art market and to ensure that they were known in the USA. Through Scheyer’s establishment of her own exhibition house in the Hollywood Hills, the “Blue Four” had a direct influence on the Californian art scene. Their works are exhibited in renowned galleries and museums around the world and are now part of important private and institutional art collections.