This was the start of a small industry of making symmetric Venn diagrams, which Branko Grunbaum found in 1975. I have been working on making a mathematical coloring book (first edition should be - needs to be - done by the holidays, so more details on that soon). I've been trying to making some symmetric Venn diagrams for it, this is a by-product of my first attempts:

## Sunday, November 23, 2008

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## 1 comment:

Hi,

How would you do a symmetric 3-Venn of ellipses? Then given the 3-Venn of circles is not a general solution for area proportionality how would you perturb the 3-Venn of ellipses to provide an area proportional solution with the strict condition of connectedness?

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