This interactive prototype demonstrates a label placement algorithm for maps, rendering a world map with city labels sized by population and color-coded population density contours. The visualization uses D3.js for map projection with `geoNaturalEarth1`, data loading, and zoom interactions, while `rbush` implements spatial indexing to detect overlapping labels. City data comes from a reduced world cities CSV file, and geographical boundaries are drawn from TopoJSON world atlas data. The prototype filters cities by a population threshold and iteratively adjusts label positions to minimize collisions against the computed bounding boxes from SVG text elements.