This example displays the world's countries on a natural Earth projection, with a dark blue sphere (ocean) and light green landmasses. The map is built using D3 v5’s `geoPath` and `geoNaturalEarth1` projection, while the TopoJSON library’s `feature` function converts country boundaries from the `world-atlas` dataset. Rendering occurs as SVG paths, with styling for country strokes and sphere fill.