Coloring Under the Lines in ggplot
I am tasked with explaining incredibly complex things to people who do not have a lot of time. Consequently, using visuals has been a life saver.
One day I was visiting a school explaining the Common Eurpoean Framework of Reference for Languages, which, in a nutshell, describes what language learners can do at different levels of proficiency AND the number of hours it takes for them to progress to each level.