This study traces western humanity's physical and mythological evolution from its earliest known origins to the present day. Signposts of this evolution are the taming of fire, the creation of weapons, clothing and housing to the great civilisations of ancient Egypt, Greece and Rome and religious expressions of early Judaism, Christianity and the less known Gnosticism and Alchemy. It explores the idea of unity in the disciplines of Philosophy, Psychology and Physics and its expression in Matter, Vegetation, Animals and Humans. The study also shows how the idea has bearing on decision-making of contemporary issues and how societies structure themselves based on projected ideas and inner characters. It emphasises the importance of knowing the difference between unconscious contents and the physical world to avoid possession by either side. The final chapters offer methods of forming a relationship between the physical world and the inner world of ideas and characters, and shows how the symbolic language of dreams, ideas, fantasies and synchronicities are interpreted through association, amplification and objectivity. It endeavours to categorise and describe the components of synchronicity using examples from individuals. Finally, it shows how to perceive, understand and integrate the Idea of Unity and how it supports, guides and gives meaning to our everyday lives.