# Behind the Doodle: 30th anniversary of Pi Day!

Happy Pi Day!
Celebrated each year on March 14th (3.14), Pi Day is dedicated to the mathematical constant, Pi. First recognized 30 years ago in 1988 by physicist Larry Shaw, Pi Day observers often celebrate with a slice of their favorite pie in honor of the number’s delicious sounding name.
Today’s delectable Doodle - baked & built by award-winning pastry chef and inventor of the Cronut Dominique Ansel - pays homage to this well-rounded mathematical constant by representing the pi formula (circumference divided by diameter) using — what else — pie!

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