This example displays an interactive world map with countries rendered in light green, shading to red on hover, against a blue ocean sphere. It uses the `d3.geoFahey` projection and `d3.geoPath` to convert TopoJSON country boundaries from the world-atlas dataset into SVG paths. The code loads data via `json`, adds tooltips with country names through `title` elements, and applies hover styling via CSS. The map itself is static, with no zoom or pan behavior implemented.