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More from Chalkdust
The secret life of words
Barry Pawlik builds words and sentences from doubles
Chalkdust Book of the Year 2022
We announce the shortlist of our favourite maths-themed books of last year
Prize crossnumber, Issue 14
Win a £100 Maths Gear goody bag by solving our infamous puzzle
On the cover: Harriss spiral
Find out more about the spiral trees on the cover of Issue 09
Christmas lights, trees and maths
Why do Christmas lights get tangled? And what's the perfect way to decorate a Christmas tree? Find the answers here.
Page 3 model: Hallucinations
The geometry of psychedelic hallucinations