As the weather was looking a bit iffy today, we decided to do an indoor activity.
Deborah suggested we see the hyperbolic space exhibition at the Hayward Gallery that crosses high level mathematics with crochet. Sounds unlikely, but in 1997 Dr Daina Taimina visually demonstrated the theory of Hyperbolic Space by using crochet. Nature, of course, had already done so in the form of coral reefs.
This exhibition marvelously combines crochet, coral reefs and hyperbolic space. I loved it and they nicely allow you to take pictures too.
Wondering what hyperbolic space is? This text might help.