1. Numbers

What do the proportions of Chartres Cathedral share with the life cycle of the cicada, with how we hear sound, and with the intricately designed nautilus shell? Du Sautoy investigates their sacred numbers and the power of pi.

2. Shapes

During his trip to the Giant's Causeway in Northern Ireland, Professor du Sautoy finds a fundamental truth about the universe written into the rocks. A hidden geometric force underpins all nature, from the structure of honeycombs to Pixar movies.