Biologist, physician, philosopher, and artist, Ernst Haeckel was also a prescient observer of the natural world. His highly detailed and expertly rendered illustrations, first published at the turn of the 20th century, are not only beautiful works of art, but also have scientific underpinnings. Now available as a series of large format posters sumptuously printed and suitable for framing, Haeckel's most elaborate and captivating works illustrate his fundamental notion of the unity of all living things. From otherworldly radiolaria to psychedelic sea anemones, Haeckel's science and artistry continue to provide inspiration for 21st-century illustrators, architects, graphic designers, and anyone interested in exploring nature's perfect geometry.