Have you ever wondered how you can construct a Venn diagram with more than two or three sets?

Back in 1989, I was working as the Computer Officer for my Cambridge college, Gonville & Caius. One of the Fellows, Anthony Edwards, was working on the design of a stained-glass window to commemorate the work of John Venn, an earlier Fellow of the college, and in doing so became interested in the construction of larger Venn diagrams.