Genius at PlayA mathematician unlike any other, John Horton Conway (1937 2020) possessed a rock star's charisma, a polymath's promiscuous curiosity, and a sly sense of humour. Conway found fame as a barefoot professor at Cambridge, where he discovered the Conway groups in mathematical symmetry and the aptly named surreal numbers. He also invented the cult classic Game of Life, a cellular automaton that demonstrates how simplicity generates complexity and provides