Phantomas: Arbre Généalogique de la Belgique Sauvage
This family tree of "wild" Belgium (or choose your own interpretation of "sauvage"—primitive, untamed, savage) chronicles the DNA of every independent artist's journal published in the country from 1900–1978, which is when this poster was a fun supplement to an issue of Phantomas. You can learn more about its impressive run and see a copy of nearly every issue here.