This is cool in a very geekey (sp?) way--the Seven Deadly sins as a heptagon whose combinations create 21 secondary sins.
From the Boing Boing archives for February 05, 2007 “If you arrange the 7 Deadly Sins around a heptagon label them A-G, and connect each Sin to the others, you get 21 secondary sins. For instance Sloth + Pride = Slackers.”
posted by Mark Frauenfelder at 05:16:38 PM