Evolute Spiral Frieze
The evolute spiral frieze is a wavelike pattern that mimics the waves of the sea. Its interstices (small openings) between the lines is decorates with leaves and flower buds. This design is found in the Otto-Heinrich building of Heidelberg Castle in Germany.
Meyer, Franz Sales Handbook of Ornament (New York, NY: The Bruno Hessling Company, 1904)
Courtesy the private collection of Roy Winkelman