Euler’s Number Face Mask


We’ve taken a popular mask design and infused it with color and geometry borrowed from Isa’s Euler Number watercolor painting. This mask design is constructed from organic cotton sateen on the outside and lined with a cotton shirting fabric on the interior.  The edges are left open so that an additional filter layer can be inserted if so desired. The elastic is 30″ in length and can be adjusted by simply tying a knot to shorten.

We are donating $5 from each mask sale to the Brennan Center for Justice. The Brennan Center is an independent, nonpartisan law and policy organization. They strengthen democracy and promote justice through reform like automatic voter registration, ending partisan gerrymandering, and fighting mass incarceration. The best way to defend democracy is to expand and strengthen it.


In stock

SKU: 20009 Category: Tag:
Product Story

Cloth face mask with geometric colorful square pattern derived from Euler’s Number. While these are not medical grade, they are better than nothing and are designed such that a filter can be added for additional protection. We adapted our mask pattern from State.

Pattern Story

When our son brought home his interest in irrational numbers and mathematical theorems, his excitement was contagious. His knowledge far outstrips mine, but I shared his fascination with Pi as a middle schooler. It is really fun to think of numbers unfurling in space, marching out beyond imagination and light. I also rediscovered e or Euler’s number while reading Margot Lee Shetterly’s Hidden Figures. In a scene in the celebrated movie, the protagonist Katherine Johnson used Euler’s number to calculate the trajectory of John Glenn’s space capsule on a blackboard. That moment inspired me to plot the numbers of e using a color algorithm – my own take on a color trajectory. I wanted to engage numbers in a new way and found there was an architecture, a different kind of reveal as I painted row after row of squares that looked like chiclets. I found cadence in irrationality and a new correspondence with color.


Printed organic cotton. Printed using ecologically-safe inks. Printed by Spoonflower. Handsewn by a small team of dedicated women throughout the United States.


Machine wash cool on a gentle/delicate setting, using phosphate-free detergent. Machine dry on a low temperature setting.



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