If the song “The Twelve Days of Christmas” had gone up to day 16, that line might have gone “sixteen teals a-tessellating”, and it might look like the above video, made by Chris Watson.

Chris has made some worksheets which can help you make your own tessellations. He also sells his own work at tessellationart.com.

This is part of the Aperiodical Advent Calendar. We’ll be posting a new surprise for you each morning until Christmas!