Venn diagrams are used in set theory to show all of the possible mathematical or logical relationships between sets or groups of things. The diagrams usually consist of overlapping circles. Consider a simple example of a set of all red objects and a set of all apples. One circle represents everything that is red; the second circle represents all apples; and the area that is common to both circles represents all red apples.
John Venn, a British logician and philosopher, created Venn diagrams in the 1800s, and they are used today in set theory, probability, logic, statistics, and computer science. Jessica Hagy has raised the Venn diagram to an entirely new level. She comments on culture through what she calls her "mildly snarky" diagrams.
"I think I learned Venn diagrams in seventh or eighth grade. I hadn't used them a lot before I started doing this. You sort of file them away like the capitals of all the states."
Hagy works in the advertising industry and has done extensive research on American consumer culture. She finds unusual connections: Jesus and Elvis, for example. Rice Krispies and arthritis. Rich old women and pimps.
Sometimes it takes a bit of time for her admirers to discover the connection, even with the help of Hagy's diagrams. But when the "A-Ha!" moment comes, you feel happy and just a little proud of your cleverness.
She's created 1,400 or so of her diagrams on index cards, and posted over 600 on her blog and elsewhere. Almost 100 appear in this book. You may find the diagrams weird; Hagy expects that: "I think everyone brings their own weirdness to it. They interpret in their own way."
Hagy maintains an excellent blog and has contributed to "The New York Times" blog on 'Freakonomics'. This book is a great introduction to her work.
Robert C. Ross 2008