This brilliant example is by GuyBlank. There’s a t-shirt version here: goo.gl/VGA8nV
Venn diagrams are used to show commonalities and differences, primarily in mathematics, statistics and logic. Named after John Venn, a logician and philosopher, who highlighted them in an 1881 paper. They were developed from Euler diagrams of the 18th Century. By the way, Venn also built a machine that bowled cricket balls.
In the popular sector, they’re mainly used for jokes.
Below, a serious Venn diagram that shows the common uppercase letters of the Greek, Latin and Russian alphabets. (From Wikipedia)
And now back to the jokes…
Mitch Goldstein’s site, “A Helpful Diagram,” highlights the concerns of designers and design students: http://www.ahelpfuldiagram.com