Each concept here is mapped to its prerequisites — the ideas you'd need first to understand it — all the way down to four foundations: Space, Time, Energy, Pattern. Click any prerequisite to drill down, or scroll for the chain graph.
External reference — all senses of the word “frontier” on Wiktionary. This atlas concept maps to only the slice of meaning relevant to the prerequisite graph.
A boundary zone of transition and interaction between settled areas and uncharted territories, marked by conflict, cultural exchange, and the push of human expansion.
Help improve this
Found an error, missing prerequisite, or wrong level? The atlas is evolving — your correction helps.