A city of the Study atlas. Each district is a field, running from mathematics and physics to mind and society. Each building is one idea, built as what it is: laws are monuments, processes move, molecules turn, disorders stand as figures with their signs.
Walk up to a building and its roads light up along the streets to every connected idea, with arcs overhead naming the relation. Boulevards between districts are named after the discovery that joins those two fields.
WASD or arrows to walk, click then move the mouse to look, Shift to run. On a phone, drag on the left to walk and on the right to look. B opens the field guide (every building as a page), P the phone (roads, directions, quiz, edit), V the aerial view. Click the map to get directions.
In Nephron Park (bottom-right district) press E at the arch to go down into a walkable nephron. Its control desk (C) holds the intake hopper, hydration lever, glucose dial, ADH and aldosterone valves and a drug cabinet, with 1D and 2D views; R rides along with the filtrate.
Teaching model; discoverer and year are the usual textbook attribution.