Geography examines the relations and interactions between humans and the environment. While geography was once focused on describing various places and objects, it now studies the forms and meanings that emerge from the relationships between environmental objects. Geography exists in the space between other fields that have "shared" the objects of nature and environment. It is concerned with the conditions of existence and unity of places, like mathematics examines the power that holds atomic nuclei together. Modern geography creates imagined maps and systems to frame ideas rather than describe physical spaces.