“We use two and three-set Venn diagrams for working out simple logical puzzles,” Cameron says. “Beyond that, I don’t think anyone but the most hardcore geometer would use a Venn diagram.

Not merely visual aids, Venn diagrams can help us solve everyday logic problems, and they give rise to surprising geometric questions. Have you ever seen a proper Venn diagram with four ...

For example, during the pandemic, Venn diagrams helped to illustrate symptoms of COVID-19 that are distinct from seasonal allergies. They are also often taught to school children and are typically ...