Color has recently become the focus of scholarly discussion in many fields, but the categories of art, craft, science and technology, unreflectively defined according to modern disciplines, have not been helpful in understanding color in the early modern period. 'Color worlds', consisting of practices, concepts and objects, form the central category of analysis in this volume. The essays examine a rich variety of 'color worlds', and their constituent engagements with materials, productions and the ordering and conceptualization of color. Many color worlds appear to have intersected and cross-fertilized at the beginning of the seventeenth century; the essays focus especially on the creation of color languages and boundary objects to communicate across color worlds, or indeed when and why this failed to happen.