This example demonstrates fundamental DOM manipulation by rendering a smiley face with animated eyebrows, built using D3.js v5. The visualization uses `d3.select` to target an SVG element and `d3.scaleLinear` to map data, though the code also includes a CSV loading attempt with `d3.csv` that references a population dataset. The face is drawn through SVG rect elements appended to the chart, with the eyebrow movement implied by the code's structural setup. The example relies on raw SVG attribute manipulation rather than higher-level layout or force simulation APIs.