Set Theory

Those who have spent time in England are probably familiar with Blue Plaques. They are historic markers connecting notable historical figures (dead at least twenty years) to the buildings where they lived or worked.  Alternative Plaques have been put up by Hull company Drunk Animal Creative Studio to celebrate "living legends and stories that make our city special". This clever one posted by Futility Closet marks the birthplace of John Venn who introduced the Venn Diagram.