The book describes a completely new world, the existence of which no one had even suspected before. Therefore, this world could not be studied either theoretically or experimentally. The study of the nature of ball lightning made it possible to discover this world. Pyotr Kapitsa, a Russian scientist, Nobel Prize winner, studying the phenomenon of ball lightning, was forced to admit at the end of his life that this bright nut was too strong for his teeth. At the same time, he suggested that ball lightning is a phenomenon from another world unknown to him. Indeed, he was partly right. He was wrong that ball lightning was related to plasma, but he was right that ball lightning belonged to another world unknown to him. The book describes the features of this world and the properties of its inhabitants. The most known among them is ball lightning. This world we called the world of circulating light. This book is not science fiction. The book is based on over eight dozen articles published since 2003 in leading international physics and optics journals. Although scientists have not been able to unravel the nature of ball lightning for many centuries, it turned out that the explanation is so simple that it is accessible to schoolchildren. Such an explanation can be given without a single formula, recalling only the well-known physical laws from the school curriculum.