This example displays a world map using a natural Earth projection, with countries filled in light green and the surrounding sphere in sky blue. It renders geographic data as SVG paths using `d3.geoPath` with `geoNaturalEarth1`. The map loads a TopoJSON file from a GitHub gist, converts it to GeoJSON with `topojson.feature`, and appends country paths to the SVG. The styles define a black stroke with low opacity for country borders, creating a subtle outline effect.