This example displays a world map rendered as an SVG using D3 v5 and TopoJSON. It shows country boundaries and a green sphere representing the Earth’s surface. The code loads geographic data from a JSON file, processes it with the `feature` function from TopoJSON, and projects it using `geoNaturalEarth1`. Paths are generated with `d3.geoPath` and styled with blue country fills and black strokes.