A world map rendered with SVG paths shows countries in blue on a graticule; clicking a country switches the map between orthographic and Mercator projections, and the map can be rotated by dragging. Built with D3.js, it uses `d3.geoPath`, `d3.geoOrthographic`, `d3.geoMercator`, and `d3.geoAlbersUsa` for projections, and `d3.drag` and `d3.zoom` for interaction. Country boundaries come from the `world-atlas` TopoJSON dataset, while country names are loaded from a TSV file.