A spinning globe made with d3-geo shows countries in a black-and-white orthographic projection, automatically rotating around the vertical axis as graticule lines and a sphere outline remain visible. Using `geoOrthographic`, `geoPath`, and `geoGraticule`, it renders country polygons from TopoJSON data fetched from the visionscarto-world-atlas via `topojson.feature`. Animation is driven by `requestAnimationFrame` and `setState`, decrementing the projection’s rotation along the longitude axis. Both `map.js` and `index.js` coordinate state updates to redraw the globe smoothly, making it suitable for observing the distribution of land and sea over time.