When Bauhaus sends you a postcard...

In 1923, a flurry of colorful postcards heralded the first major Bauhaus school exhibition. Both students and established artists including Paul Klee, László Moholy-Nagy, Wassily Kandinsky, and Herbert Bayer offered snapshots of the German modernist aesthetic that would majorly influence art and design for the rest of the 20th century.
https://hyperallergic.com/221572/the-exuberant-postcard-art-of-the-first-bauhaus-exhibition/