How can we reason more effectively ? Everyday, we solve countless problems and take decisions by trusting our intuition, our common sense. Often, it is not only our passions, our emotions that lead us astray, it is the mind itself which tricks us, without us even being aware of it. How can we avoid these traps ? By driving out into the open, with the help of Massimo Piattelli Palmarini, the natural illusions and unconscious mechanisms which occupy our minds, and by working to help our judgement in the same way as psychoanalysis works to improve our emotional lives.