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.
Having small width emerges from the concept of size, which is a fundamental property that can be measured in space, and is the opposite of having great extent from side to side, or being wide.
External reference — all senses of the word “narrow” on Wiktionary. This atlas concept maps to only the slice of meaning relevant to the prerequisite graph.