A. Westbrook & O. Ratti / Charles E. Tuttle Company (1970)
Summary: Aikido and the Dynamic Sphere is a comprehensive technical introduction to 1960's-era Aikikai Aikido as taught in the United States. The book is effectively in two parts. The first part provides an overview of Aikido, including its history and organization, its technical place among other Japanese martial arts, its primary technical features, and its theory of defence. It is from this theory of defence that the book draws its title.