David Colquhoun and Rafael wearing t-shirts, and a close-up of the t-shirt
More from Chalkdust
Things to make
Platonic shapes from tube maps, flexagons, and more mathematical craft
What’s hot and what’s not
Optimal Pac-Man
Ghostbusting with graph theory
Reinventing 2D
What a difference a matrix makes
Your social networks
How similar are you to your friends?
Art meets maths