The Guinness World Record for the most memorized digits of pi is held by Rajveer Meena, for memorizing 70,000 decimal places of the mathematic concept. The Guinness World Record for the world's largest pie is 20 feet across and weighs 3,699 pounds. The highest anyone in the DBH staff can count to Pi is only seven digits. And National Pi Day, March 14, was declared a holiday in 2009 by the U.S. House of Representatives.

And for Pi Day 2016, Design by Humans has you covered, with our National Pi Day Collection! Some of our favorites are below, and you can shop the entire collection for all your pi needs here.

**Pi Day Vortex Mathematical Constant**.
This simple vortex pattern can count to a higher digit of pi than I could ever dream.

**Pi in the Sky**
Have a Starry Pi Day celebration with this Van Gogh inspired shirt. A little geeky, a little arty, a whole lot of awesome.

**Earth Noms**
Earth day, Pi day, Earth pie, why not all of the above? Celebrate the world of desserts in this clever design.

**Apple Pi**
What's your favorite kind of pie? Mine is apple, so this is the perfect shirt for me to celebrate pi day in.

**Pi Master**
Are you the Pi Master? Let people know with this clever mathematic pastry design

Remember, National Pi Day is March 14, and you can view our whole celebratory collection here!

So how are you celebrating Pi Day? Be sure to let us know in the comments!