This example visualizes world countries with a natural Earth projection, displaying landmasses in teal, graticules as light gray lines, and country borders in a darker teal. The SVG rendering uses React state to load geographic data from the World Atlas TopoJSON file via `json` and `feature`/`mesh` from TopoJSON, then draws the sphere, graticule, land polygons, and interior borders with `geoNaturalEarth1`, `geoPath`, and `geoGraticule` from D3.