Mathematical! It's the Pi Day Collection
http://www.designbyhumans.com/forum/dbh-news/1245702/mathematical-its-the-pi-day-collection/
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 by happycolours
This simple vortex pattern can count to a higher digit of pi than I could ever dream.
Pi in the Sky by PinkVampCat
Have a Starry Pi Day celebration with this Van Gogh inspired shirt. A little geeky, a little arty, a whole lot of awesome.
I saw someone say "Happy Pi Day ! on tv today.
I'll have a slice of blueberry pi, please. Oh, with a scoop of ice cream, or as it's known pi-plus.