This is a set of 3 postcards by Friedensreich Hundertwasser. From his original work titled Spirale in Schweinfurt und Vermillon- Spiral in Paris Green and Vermillion. The postcards measure 5-7/8" x 4-1/8" and are in good condition.
Friedensreich Hundertwasser : The spiral artwork he often uses in his art, viewing them as symbols of life and nature and considered straight lines "godless". His spirals are not perfect geometric shapes, but rather irregular and organic forms.