This example displays a world map using an equirectangular projection, with countries filled in orange and outlined in blue against a light blue ocean sphere. The visualization highlights individual countries in red when hovered over, providing interactive feedback. It loads world country boundaries from the world-atlas TopoJSON dataset via `d3.json`, converts them to GeoJSON with `topojson.feature`, and renders them using `d3.geoPath` with `d3.geoEquirectangular`. The SVG elements are styled through CSS classes for the sphere and countries.