By stitching carefully between a set of points, you can create a parabola – these Christmas cards have taken this idea and given it a festive twist.

In this 2015 post on Alex Bellos’ Guardian Blog, Oxford’s Vicky Neale has explained how the process can be used to create a parabola using equally spaced dots, card and sewing thread. There are plenty of nice examples, and full instructions and guidance on how to make your own at home. Lovely!

This post is part of the Aperiodical’s 2018 Aperiodvent Calendar.