This example displays a world map using a natural Earth projection, with countries rendered in brown and the surrounding sphere in light blue. It demonstrates fundamental D3.js DOM manipulation by appending SVG paths for each country from TopoJSON data loaded from a remote gist. The code uses `d3.geoNaturalEarth1`, `d3.geoPath`, and `topojson.feature` to convert geographic data into SVG path strings, while D3’s selection and data-join methods handle the dynamic creation of country elements.