Materials system flowcharts, Olson diagrams, provide invaluable maps to chart courses between initial sets of performance criteria to needed new materials. Planning the best route from origin (performance) to destination (processes) requires knowledge of the infinite number of paths connecting process to structure, structure to properties, and properties to performance. Sadly, in many cases the landscapes these paths cross are under explored, particularly the region between electronic structure and properties—the dark continent of structure property relationships. As we seek to turn possible paths into the well-trod roads used by future materials designers, we must first identify starting points for our roads. Simply stated, what is the best description of electronic structure leading most directly to properties? Supported with examples, I will argue that describing charge density in terms of its topological and geometric properties is the most productive starting point from which to begin constructing electronic structure property relationships.