In 2005, Greg Christie was working on the device that would become the iPhone, and running out of time. As a senior software engineer at Apple, Christie had been given an ultimatum by Steve Jobs: bigger ideas and bigger concepts for the iPhones software in two weeks, or else the project would be given to another group. In response, Christie and his team developed a set of features — such as swiping to unlock the phone — that came to define the way smartphones were designed. …