In the hopes of widening the public’s understanding of naturalism, German biologist Ernst Haeckel published Kunstformen der Natur (or Art Forms in Nature) in 1904. The work, equal parts scientific text and artistic endeavour, highlights Haeckel’s particular interest in the symmetries in living forms. In this artwork of sea anemones, the creatures appear as an undulating, fantastic forest—a perfect setting for this 500-piece puzzle.