This post was part of the Chalkdust 2016 Advent Calendar.
More from Chalkdust
- Village fetes, Brexit and flowers are among the topics of discussion in this issue's Dear Dirichlet advice column
- Read more about the fire-breathing curves that appear on the cover of issue 05
- Solve the puzzles that appeared in Issue 05.
- Behind today's door... a quiz!
- We have received loads of feedback from people telling us their favourite function
- Three ways to obtain and generalise a beautiful fractal