caption: The image shows a set of four postage stamps from Germany circa 1974, each featuring a painting by Franz Marc. The stamps are arranged in a collage-like fashion, with each one featuring a unique painting. The colors used are mostly shades of blue, green, and yellow, with some hints of red and orange. The painting itself is a mix of abstract shapes and lines, with a variety of colors including blues, greens, yellows, and reds.