When linguists talk about the historical relationship between languages, they use a tree metaphor. An ancient source (say, Indo-European) has various branches (e.g., Romance, Germanic), which themselves have branches (West Germanic, North Germanic), which feed into specific languages (Swedish, Danish, Norwegian). Lessons on language families are often illustrated with a simple tree diagram that has all the information but lacks imagination. There’s no reason linguistics has to be so visually uninspiring. Minna Sundberg, creator of the webcomic Stand Still. Stay Silent, a story set in a lushly imagined post-apocalyptic Nordic world, has drawn the antidote to the boring linguistic tree diagram.
Also worth checking out is the page before the tree, where she gives a comparison chart of words in the Nordic languages, and illustrates what an outlier Finnish is with the concept of “meow.”