This is the Giant's Causeway at the northern tip of Northern Ireland, and it's famed for these strange angular rocks. There are 40,000 of them crammed into this small area of coastline. What makes them so striking is that they're so regular, so simple, they just don't seem to fit in to this rugged natural environment. The mystery of these hexagonal rock formations has inspired storytellers and composers. But their strange beauty is only the start of the story. Because these stones tell of a hidden geometric force that underpins and pervades all nature. And if we can uncover that force, it'll help us to explain the shape of everything... from the smallest microbe, to the construction of these stones and the formation of the world itself. As a mathematician, I'm fascinated by the numbers and shapes we see all around us... to bubbles and the handwork of our distant ancestors to the imagination of our greatest modern artists. These are the hidden connections that make up the Code... of numbers that has given us the most detailed description of our world we've ever had.