Zoologist and artist Ernst Haeckel (1834 – 1919) had some odd ideas about the origins and evolution of life forms. That's understandable, because at the time, scientists were just beginning to accept Darwinism. (Haeckel himself was a champion of Darwinism, but he added Lamarckism and some unpleasant conjectures about race into his philosophical worldview.)
This remarkable page of expressive bat face drawings was posted last week on Open Culture. It can also be found in the book, Art Forms in Nature, which was originally published as a series of portfolios between 1899-1904. This book of the same name compiles 100 color plates of Haeckel's meticulously composed, obsessively detailed drawings of plants and animals arranged to show the similarity of different species. Haeckel's lifeforms radiate vitality from the page and the peculiar way they are drawn seems to stimulate the same part of the brain that's affected by psychedelic drugs.
The plates were intended to illustrate Haeckle's ideas about life and evolution, but they ended up being more important to artists than scientists. His blend of crystalline geometric patterns and swooping organic curves feels very Art Nouveau, and in fact many Art Nouveau artists were influenced by Haeckel's drawings. His work continues to inspire and amaze people today.