This example shows a dark, starry map of cities with populations over 50,000, using glowing points that mimic fireflies. It loads city data from a CSV and renders the points over an inverted Stamen toner basemap with OpenLayers. The glowing effect is created with a custom Canvas sprite, a radial gradient, and a Gaussian curve in `generateSprite.js`, while React manages the map lifecycle and D3 loads the data.