Ernst Haeckel artwork can be a puzzle-box for my eye. Haeckel illustrates the beauty and diversity in biology. He draws basic laws of form that move and evolve, creating skeletal structure, celebrates symmetry and order in the mathematical chemistry of nature.
He is an interesting person, although much of his work in biology has been disputed and rejected. Still, his pictures are really damn nice. I like to go through his book of illustrations “Art Forms in Nature” from time to time. The organic geometry is beautiful!