Luc de Brabandere has had three careers in his fifty years of professional life. He started out as a computer engineer, before becoming a consultant in creativity, and today he is a corporate philosopher. This journey has led him to investigate successively the three modes of thinking that are permanently articulated within us: logical thinking, creative thinking and critical thinking. As a talented popularizer, he puts forward an ambitious yet accessible summary of the main principles that govern these three modes of thinking. The book is richly illustrated and places thinking in an historical perspective that allows us to better understand how informational technology in general, and ChatGPT and other artificial intelligences in particular, are influencing our mental models. In the first part of this book, thinking is presented as a game whose rules need to be understood in order to be able to play the game better. A machine can't be creative or responsible. So the more machines there are, the more thinking we'll need to do!