A spinning globe uses an orthographic projection to display world country boundaries from a TopoJSON file. The globe rotates continuously around its vertical axis as the projection’s rotation state updates on each animation frame via `requestAnimationFrame`. The code applies `d3.geoOrthographic`, `d3.geoPath`, and `d3.geoGraticule` to draw country paths, a graticule, and a sphere outline, with state managed through setState and cleanup.