This document discusses the development of "c-books", which are interactive e-books that aim to foster creative thinking. C-books will contain widgets that allow for dynamic manipulation and constructionism. They will also support collaborative design and will include analytics of how readers interact with the content. The project aims to determine if c-books could serve as a new type of expressive medium and promote social creativity and mathematical thinking in new ways. Key goals are to integrate diverse interactive elements, enable collaborative authoring, and analyze usage data. The project researchers are evaluating how effectively c-books can engage readers and generate novel outcomes through a design process within a community.