Solve the Problem of Glass Rings With Math Coasters
No one likes the ugly sight of a condensation ring on the coffee table. This is a problem. Thankfully, there’s a solution, and it’s full of math.
The math coasters, which are available in a variety of classy colors (as pictured above), are sold in sets of five for $22. Numbers are, unfortunately, not included. It’s Etsy, though… if you search long enough, you’ll probably find something to complement your coaster set.