First, let’s Wikipedia make clear who Ernst Heackel is:
Ernst Heinrich Philipp August Haeckel (February 16, 1834 – August 9, 1919), also written von Haeckel, was an eminent German biologist, naturalist, philosopher, physician, professor and artist who discovered, described and named thousands of new species, mapped a genealogical tree relating all life forms, and coined many terms in biology, including phylum, phylogeny, ecology and the kingdom Protista. […]
The published artwork of Haeckel includes over 100 detailed, multi-colour illustrations of animals and sea creatures (see: Kunstformen der Natur, “Artforms of Nature”).
Second, Here are some awesome illustrations from his Kunstformen der Natur via Wikimedia Commons:
Third, what Subblue made of these images using a couple of image filters:
pretty neat right? I thought so.