Ian Stewart is an Emeritus Mathematics Professor at the University of Warwick and a Fellow of the Royal Society. He is author or coauthor of over 190 published research papers on pattern formation, chaos, network dynamics, and biomathematics. He has published over 120 books including ‘Does God Play Dice?’, ‘Nature’s Numbers’, ‘Why Beauty is Truth’, ‘Professor Stewart’s Cabinet of Mathematical Curiosities’, ’17 Equations that Changed the World’, ‘Infinity’, ‘Calculating the Cosmos’, and the four books of the bestselling ‘Science of Discworld’ series with Terry Pratchett and Jack Cohen. He has five honorary degrees, and his awards include the Royal Society’s Faraday Medal, the IMA Gold Medal, the AAAS Public Understanding of Science Award, the LMS/IMA Zeeman Medal, the Lewis Thomas Prize, and the Euler Book Prize. He is an honorary wizard of Unseen University on Discworld. In this exclusive interview he discusses the mathematics behind patterns in Nature.