Sixty-four hidden units in four functional communities. Click any unit. On the lattice tab, units sit where we arbitrarily placed them, so the blob recruits grid neighbors — a mixed bag of outline colors: the move perturbs functionally unrelated units together. On the graph tab, the same units are laid out by who fires with whom, and the heat kernel exp(−tL) diffuses along that wiring — the same click now recruits almost exclusively one outline color. Drag t small and the blob collapses to single-unit edits: the radius anneal, on a graph.