Math whiz Vi Hart makes a pie for Pi Day, even though she doesn't like pi, finds it boring, and prefers tau. But she likes to cook. This year, she's been thinking about Venn diagrams, so she made a Venn "pieagram."
Okay, she started out to make a fruit pie, and ended up with a fish pizza. Read the chain of thought that led Hart to make this pie at her blog. (via Boing Boing)