If you’re a regular reader of this blog, then you might recall that I recently attended an art event at the National Museum of Mathematics (aka MoMath). On the way out of the museum that evening, I decided to pop in to the gift shop, where I noticed something at first seems a bit incongruous: a tiny Pink Bathtub . . . that was in use as a bin to hold little soaps shaped like the Pi symbol. Oh, the cleverness.