This book suggests that an approach to collaborative dynamic geometry can be designed to transform the teaching of Euclidean geometry from a rigidified procedural approach based on memorization of authoritative texts to a human-centered exploration of a foundational source of informatics and rigorous thinking. It introduces a research project to explore the proposed translation of geometry education. This example of the redesign of a subfield of human-centered informatics involves multiple inter-related dimensions, including cognitive history, contemporary philosophy, school mathematics, software technology, collaborative learning, design-based research, CSCL theory, developmental pedagogy, and scaffolded practice.