Vintage-inspired wooden graphic print of Pi with distressing to give it an aged look. Perfect for the math enthusiast. The ratio of the circumference of a circle to it's diameter....otherwise known as Pi has been studied for millenia. Pi is actually a part of Egyptian mythology and the pyramids of Giza were built on the principles of pi. The vertical height of the pyramids have the same relationship with the perimeter of their base as the relationship between a circle�s radius and its circumference. The record for reciting the most number of decimal places of Pi was achieved by Rajveer Meena awho was able to recite 70,000 decimal places. Interestingly, Princeton's most famous resident, Albert Einstein was born on Pi Day 3/14 (or 3.14). Dimensions: Since the sign is 24 inches in diameter...using Pi, can you find the circumferance? Made in USA.