The Cartesian Split examines the phenomenon of Cartesian influence as a psychological complex in the Jungian tradition. It explores the full legacy of Cartesian rationality in its emphasis on abstract thinking and masculinisation of thought, often perceived in a negative light, despite the developments of modernity.The book argues that the Cartesian creation of the Modern Age, as accompanied by a radical dualism, is better understood as a myth while acknowledging the psychological reality of the myth. The Cartesian myth is a collective dream, and the urgency of its rhetoric suggests that an important message is being left unheeded. This message may lead us to answers in the most unexpected place of all. The book brings forth the Cartesian myth in a new context and shows it to have potential meaning for us today.The book will be of great interest for academics, researchers, and post-graduate students in the fields of analytical psychology, mental health, comparative mythology, and Jungian studies.