In a Voronoi diagram each colored region is the set of all locations on the plane that are closer to the black node inside the region than to any other nodes. I have 50 (now 10 000) random nodes and each start with a separately colored circle of radius 200 pixels. Then the circles start shrinking slowly leaving behind the Voronoi diagram as they diminish. If the animation is jumpy Turbo Mode (Shift+Green Flag) may help
Remix: I made more nodes to be made and made text read on it.