hideback:Claude Bragdon (American, 1866 – 1946)Mathematical Abstraction No. 5 “Study in complementar
hideback:Claude Bragdon (American, 1866 – 1946)Mathematical Abstraction No. 5 “Study in complementaries”, circa 1940Design for Decorative Lighting, circa 1925Mathematical Abstraction No. 14 “The sun by day and the moon by night”, circa 1940 -- source link