Venn in Wonderland: Paper on Nested Venn Diagrams & Lewis Carroll Diagrams Available
I did a bit more work on those nested Venn Diagrams, including research that turned up an alternative to Venn Diagrams produced by Lewis Carroll, known naturally enough as Lewis Carroll Diagrams.
You may recognize the two-set version as the same structure used in the more recent "Boston Box".
It transpires that Carroll used nesting of his diagrams as far back as 1896. Here is his diagram for eight sets.