More from Chalkdust
- David Sheard sets the third puzzle. Can you solve it?
- David Sheard explores the rich mathematics and history behind the Apollonian packing, and the cover of issue 11
- Looking back at puzzles about complex numbers, tic-tac-toe, and the Eggnog Mystery
- Surprise yourself by making this thing
- The geometry of psychedelic hallucinations
- Are you a FX-82 or an FX-85 fan?