A yellow smiley face is drawn as an SVG circle with animated eyebrows made of rectangles. The eyebrows transition upward and then return to their original position over two seconds each using D3's `transition()`. The face is built with D3 selections, appending elements like `circle`, `rect`, and `path`, while the mouth uses the `arc()` generator. Data is hardcoded in `index.js`, and the visualization runs entirely in the browser with D3 v5.