In this volume, algebra and algebraic reasoning are proposed as a core constituent of a general mathematics education that extends throughout schooling. We share this conviction with the contributors to this volume, but we aim to extend the franchise to space and geometry as a complementary strand in a general mathematics education (Lehrer & Chazan, 1998). Rather than place these two strands in competition for curricular space and time, we propose synergy: Visualization bootstraps algebraic reasoning and algebraic generalization promotes seeing new spatial structure (Goldenberg, Cuoco, & Mar, 1998).