This example displays a natural Earth projection of the world map, rendered as a dark blue sphere with green country polygons outlined in black. It loads world country boundaries from a TopoJSON dataset and converts them to GeoJSON using the `feature` method from topojson. The map is drawn with D3’s `geoPath` and `geoNaturalEarth1` projection onto an SVG, while CSS styles define the fill and stroke colors for the sphere and countries.