This article is mainly based on R. E. Kahn's contribution to the book Non Linear Dynamics in Human Behavior. As stressed by Bronowski, both in art and in science, a person becomes creative by finding "a new unity" that is a link between things which were not thought alike before. Indeed the creative mind is a mind that looks for unexpected likeness finding a more profound unity, a pattern behind chaotic phenomena. In the context of scientific discovery, it can also be argued that creativity is linked to a search in a space of hypotheses and a space of experiments. This "Dual Search" involves the formation of new hypotheses and new experiments which are then linked by a comparison of the prediciton derived from a hypothesis with the results obtained from the experiment. Enclosed: Appendix 1 Chaotic Phenomena, Appendix 2 The Logistic Map Appendix 3 Lorenz Model