We spend quite a few years of our life playing and imagining situations that are hardly credible. Why? The evolutionary reply is that it helps us think about the alternatives. Imagining brings in a new dimension, that of what might be and not just of how things actually are. This is a typically human trait that distinguishes us from animals. It allows us to experiment solutions and evaluate ideas without having to live them with all the possible risks this means. At the end we can choose the best solution of the many we tried out. Imagination helps us understand causality, create new rules, have new aspirations and create new worlds. Newborns begin with innate behaviors which are conservative in nature. They have been selected throughout the history of human life because they offer the best chance of survival. And so, newborns suck to drink milk without having to be taught. Soon the newborn starts ‘studying’ but is no longer conditioned by the history of the human species and so it does so on its own. This brings many advantages and a few limitations. In fact, if one is in a new and dangerous situation, past lessons are of no use and the risks could be great if one must develop an experience that is useful for the future. Any mistake might be fatal. In such a case imagination is useful. Differently from innate or previously learnt behaviors, imagination is creative and allows one to imagine combinations of solutions to overcome the difficulty without running risks because everything happens in the mind of the ‘dreamer’ and not on the battlefield.