A smiling yellow face is drawn with SVG circles, rectangles, and an arc path, then animated when its eyebrows jump upward and settle back down. The example uses D3.js version 5 selections and transitions, including `transition().duration()` to move the eyebrow group's `transform` attribute. A React starter variant is mentioned in the README, though the core code relies on D3’s `select`, `arc`, and attribute manipulation to compose the face from basic geometric shapes.