This example shows a world map rendered with D3Overlay, featuring light green countries on a dark blue spherical background using a Natural Earth projection. The visualization loads geographic data from the World Atlas TopoJSON file and converts it to GeoJSON features using the `topojson.feature` API. The code employs `d3.geoPath` with a `d3.geoNaturalEarth1` projection to draw country boundaries as SVG paths, and includes a separate path for the sphere outline.