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 pyramid is a monumental structure built from stone, often used as a tomb for the dead, with triangular sides that emerge from the need for grandiose architecture in ancient societies.
External reference — all senses of the word “pyramid” on Wiktionary. This atlas concept maps to only the slice of meaning relevant to the prerequisite graph.