We think with our bodies, not just our brains, and cognitive scientist Barbara Tversky argues that spatial reasoning underlies all abstract thought. Before language, before symbols, humans navigated physical environments, tracked moving objects, and manipulated tools. These capacities became the foundation for thinking about everything from social relationships to mathematical proofs. Tversky, a professor at Stanford and Columbia who has spent decades researching how people think about space, grounds her argument in extensive experimental evidence. She shows how spatial terms structure language across cultures, how gestures reveal thought processes that speech conceals, and how diagrams and maps serve as external cognitive tools. The body itself becomes a cognitive resource as we simulate actions to understand them, using motor systems to comprehend sentences about movement. The book examines how spatial thinking shapes design, from architecture to information graphics, and how it can be taught and enhanced. Tversky challenges the primacy of language in cognitive science, arguing that linguistic thought depends on and develops from more fundamental spatial capacities. Her synthesis brings together research from psychology, linguistics, philosophy, and design in accessible prose. Readers interested in cognition, creativity, or the nature of understanding will find her argument that the mind is grounded in the body and world both scientifically rigorous and intuitively compelling.