This example renders a world map with D3.js, displaying country boundaries and a blue sphere as the base layer. It uses the `geoNaturalEarth1` projection and `d3.geoPath` to generate SVG paths from TopoJSON data loaded from the world-atlas dataset. The visualization demonstrates a simple two-step workflow: drawing the sphere outline first, then fetching and appending each country's path via `topojson.feature`. The map is styled with CSS, using a light green fill for countries and a dark blue ocean, with a clean, minimal aesthetic.