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.
A door is a component of a building that provides a controlled passage between spaces, emerging from the need to separate and connect different areas within a constructed environment.
External reference — all senses of the word “door” on Wiktionary. This atlas concept maps to only the slice of meaning relevant to the prerequisite graph.
Trace. Question. Emerge.