Venn diagrams are a high-school math rite of passage, teaching us (to hate) the logical relations between sets. Google has now honored their creator, John Venn, with his own interactive Google Doodle. Mountain View said it was going for "sound logic and silliness" by letting you pick between five objects in two sets to see what they have in common. For instance, the relationship between "Transport" and "Thrives in Cold" as shown above is "Zamboni," the ice-rink vehicle honored in a previous Doodle. You can try the other 24 possibilities yourself today at Google.com, or check some of the better Doodles from the past here.