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 sequence of items takes on a new dimension when we consider the accumulation of a series of related items unfolding over an extended duration, allowing us to perceive a measurable magnitude and amount within the three-dimensional expanse.
External reference — all senses of the word “long train” on Wiktionary. This atlas concept maps to only the slice of meaning relevant to the prerequisite graph.
Trace. Question. Emerge.