In recent years, we have seen an exponential increase in interest in studying insight and creativity. Some creative ideas come to mind gradually, but others emerge as sudden flashes of inspiration. What causes these fascinating moments when – unexpectedly, and to our surprise and delight – a marvelous new solution emerges into consciousness? This is the wonder of insight that the chapters in The Emergence of Insight have described efforts to understand and explain. Although solutions reached via insight may be less common than more routine or step-by-step analytical solutions, the Aha! experience seems ubiquitous, familiar to all, and easily recognized. But what is an insight? Understanding insight itself presents an ill-defined problem that is yet to be solved.