This example displays an interactive world map using an equirectangular projection, with countries rendered as yellow SVG paths against a blue sphere background. Hovering over a country highlights it in red. The visualization loads GeoJSON country boundaries from the world-atlas TopoJSON dataset via `json()`, converts them using `feature` from topojson, and draws them with `geoPath` and `geoEquirectangular` from d3. Styling and hover effects are handled through CSS classes on the SVG path elements.