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 shoulder emerges as the joint connecting the arm to the torso, where the arm is a biological structure composed of body and organ, and the body is a coordinated system of interconnected parts.
External reference — all senses of the word “shoulder” on Wiktionary. This atlas concept maps to only the slice of meaning relevant to the prerequisite graph.
Trace. Question. Emerge.