This example shows a stylized smiley face built with D3.js that animates its eyebrows up and down. The face is constructed from SVG shapes: a yellow circle for the head, two dark circles for eyes, and a path generated with the `arc` function for the mouth. The eyebrows are rectangles that move via chained `transition().duration(2000)`, shifting vertically to create a playful expression. D3 v5 selections and attribute methods are used throughout, with the entire figure centered in a green-background SVG.