Yesterday was "Pi Day", in honor of the famously infinite math constant that starts with 3.14 and stretches on forever. The cool people of the CodePen Creative Challenge are stretching the celebration out into Pi Week with the #CCC Happy Pi Day Challenge. The fun started over the weekend and is running through this Friday, March 18th.

Here are just a few of those tasty Pi Pens!

Gabi's vibrant "Happy PI Day 2016!"

See the Pen HAPPY PI Day 2016! by Gabi (@enxaneta) on CodePen.

Dan Wilson's hypnotic "Pi-ish Pies"

See the Pen Pi-ish Pies by Dan Wilson (@danwilson) on CodePen.

Tiffany Rayside's mind-boggling "Ԉ Shuffle"

See the Pen Ԉ Shuffle by Tiffany Rayside (@tmrDevelops) on CodePen.

Johan Karlsson is gathering all of the Pi Pens in his Happy Pi Day Challenge collection. Get your Pi cooking by Friday if you want in!