This example displays a world map rendered as black countries outlined with a subtle maroon stroke on a cyan sphere, using the Natural Earth projection. The visualization loads geographic data from a JSON file via `d3.json`, converts it to features with `topojson`, and draws each country path using `d3.geoPath` with a `geoNaturalEarth1` projection. The SVG output and styling are managed through `d3.select` and CSS classes.