Der Blaue Reiter (The Blue Rider) by Franz Marc and Wassily Kandinsky is a collaboration that represents the heart of the Blue Rider movement, focusing on the spiritual connection between humans, nature, and art. The painting combines Marc's symbolic use of animals with Kandinsky’s abstract expressionism, creating a harmonious fusion of emotion and color. This work is a key representation of the early 20th-century avant-garde movement and is a must-have for those passionate about Expressionism and modern art.