During our travels Reid and Liam and I (daddy) fell into a nice little entertainment in which we trained ourselves to produce Tamil Kolam. The Kolam is a marvelous mathematical art form practiced by women all over southern India, and we were practicing the ner-pulli nelevu family of kolam, which are based on an orthogonal matrix of dots connected by a curve which snakes among the dots to form overlapping loops. Learn more about them here and on my paper on the topic: Waring, T. M. (2012). Sequential Encoding of Tamil Kolam Patterns. Forma, 27(1), 83-92. [pdf].
But the point is these things are fun for car rides! Liam are Reid are both getting quite good at them now, and we’ve only started to do them.