Ernst Haeckel (1834-1919) was a German
biologist, philosopher and artist. He discovered and described thousands of new
species, mapped a genealogical tree of all species (a tree which shows how
species are related), and coined several biological terms, such as ecology and stem cell. He published his multi-colour illustrations of animals
and sea life in Art Forms in Nature
(1899-1904). His illustrations highlight how life forms are often intricate,
geometric and fractal in their structure.