"I Spy Pi" Math Headband - Adult
This product has been discontinued. But you might be able to find the design on Spoonflower.
Discontinued
With this design, the delight is in the details AND the big picture. Up close, tiny mathematical symbols, diagrams, and numbers swirl around in pink and purple. But take a few steps back and a bigger picture emerges - it’s the symbol for Pi, formed out of the negative space.
