Author: Ernst Haeckel (1834-1919), a proponent of Darwin's theory of evolution. Content: Intricate illustrations of marine organisms like radiolarians, jellyfish, and diatoms. Purpose: To showcase the symmetry and beauty found in the natural world, blending art and science. Influence: Inspired Art Nouveau and continues to influence art, design, and architecture. Significance: Haeckel's work combines scientific accuracy with aesthetic appeal, making it a masterpiece of natural history illustration. Publication: Originally published in German as "Kunstformen der Natur." Legacy: Haeckel described thousands of new species.