## geometry

**Phil Dench**tells

*Plus*how he uses mathematics to help bring these models to life.

Cambridge celebrates 25 years since the first very early Universe workshop

*any*tilings based on fiveness?

**Craig Kaplan**takes us through the five-fold tiling problem and uncovers some interesting designs in the process.

**Abigail Kirk**explores one of the formulae that carry his name.

**Tom Körner**'s explanation really is a piece of cake, served up with a hefty estimate of pi.

**Shahn Majid**met up with

*Plus*to explain.