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Those of us subjected at school to the mathematics of set theory hopefully share a common memory of Venn diagrams. These illustrate the common ground where two or more sets — depicted as interlocking ellipses — overlap.

I was reminded of this when I began trying to parse the differences between tasting, judging, enjoying and appreciating wine. This is not something any of us think about too deeply. However, I was preparing for the annual wine judging academy I run with the Graduate School of Business of the University of Cape Town and these issues are central to many of the discussions...

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