[obeattie]

I did read the article and I don't find what the author thinks is a "nice illustration of a cartesian product" easy to grok at all. Similarly, I think I would have found the the diagrams further down hard to understand versus a Venn diagram.

But that wasn't my point; if other people find these illustrations helpful, that's awesome and I wouldn't want to stop someone inventing something new and useful. My point was that I violently disagree with one-size-fits-all proclamations like "Say NO to Venn Diagrams."