A Voronoi diagram of 200 normally distributed points demonstrates an extended `voronoi.findAll(x, y, radius)` method that returns every site within a circular search radius. An animated circle expands from the center, transitioning its radius via `transition.attrTween`, updating the highlighted set of sites in orange as it grows. The static d3.svg rendering uses steelblue circles for all sites, while the black ring shows the current search boundary.