This example assembles a cartoon face from geometric primitives using D3.js v5. A yellow circle forms the head, with two black eyes, a nose, eyebrows, and a mouth built from SVG paths generated by the `arc` API. The eyebrows animate vertically via a repeating `setInterval` loop, with transitions applied using the `transition` API to move them up and down every 1.5 seconds. All elements are grouped and positioned using SVG transforms within a fixed 960x500 canvas.