An independent bookshop's footer with a pixel-square world map where every reader browsing right now shows up as a lit square that sends a ring of squares rippling out across the land, next to a live count and a short feed of who just ordered what, with a pause button for the live updates.
Ripples on a pixel lattice: rings are precomputed per city as lists of land cells by Chebyshev distance, so a ping costs a handful of fillRects per frame, and ripples that would cross water simply have no cells there.
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