This book presents the creative processes in art throughout history and cultures. A specific cognitive function, the homospatial process, is extensively documented and described, as well as short and long term scientific research in artistic creation and its applications to aesthetic appreciation. Drawing on research in psychology of creativity, creative operations, and relationship of mental health and illness to creativity, the author delves into the psychology of creativity in art and other fields, and presents intensive and experimental studies of Rembrandt's self-portraiture, controlled experimental assessment of prizewinning young artists, descriptions of three key creative processes, and in-depth exploration of the operation of the specific creative homospatial process in works of art throughout history. The book also presents specific controlled experimentation on use of the homospatial process, its application in the creation of clothing  design, and two explorations of major artists and the relationship of mental health and creativity, ending with a reflection on the role and function of creativity in society.