Pi Detector was a temporary exhibit designed to celebrate Pi Day 2021 at the National Museum of Mathematics. It illustrates on a huge scale the relationships between the diameter and circumference of a circle as it relates to the value of pi. I designed and built it along with the Associate Director of National Museum of Mathematics Tim Nissen. Tim brought the concept and some basic sketches to me and I was tasked with designing, sourcing and fabricating the actual physical and mechanical components. This included a custom, heavy-duty wall mount to allow a 3 foot across, 50+ pound circle to rotate freely while 20 feet up in the air.