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via http://www.blameitonthevoices.com/2010/12/original-venn-diagram.htmlContrary to the below, John Venn wasn’t an egomaniac when he developed venn diagrams; he called them “Eulerian Circles” in his July 1880 paper “On the Diagrammatic and Mechanical Representation of Propositions and Reasonings” (which includes a number of the “real” originals).