This example uses D3.js to draw a smiling face out of basic SVG shapes: a yellow circle for the head, two eyes, and a mouth created with the `arc` generator. Eyebrows animate by repeatedly shifting their vertical position via chained `transition().duration(2000)` calls on a group element. The code relies on D3 selections and `select`, with dimensions read from the SVG attributes. The simple, playful design demonstrates how D3 can drive both static shape construction and time-based transformations in an SVG scene.