More from Chalkdust
The Spirit of Mathematics
We review the ninth of this year's nominees for Book of the Year
How to make: tessellating shortbread
Tasty and mathematical
Unknown pleasures: pulsars and the first data revolution
The scientific story behind the cover of Joy Division's treasured debut
Too good to be Truchet
Colin Beveridge looks at different designs for 2- and 3-dimensional tiles
The Chalkdust Christmas card
This year's Chalkdust puzzle Christmas card
Roots: Pythagoras of Samos
Pythagoras gave us so much more than a² + b² = c²