Based on the intricate illustrations of Ernst Haeckel, one of the world's most celebrated naturalists and artists, this coloring book provides hours of absorbing and soothing entertainment. Ernst Haeckel's series of incredibly detailed prints have influenced designers and artists for over a century. Collected in books such as the perennial bestsellers Art Forms in Nature and Art Forms from the Ocean, they now form the basis of a beautiful coloring book that is suitable for any age.