This example animates a yellow, smiling face drawn entirely with SVG shapes, including circles for the eyes and head, rectangles for the eyebrows, and a path for the mouth. The eyebrows perform a repeated vertical bounce using D3’s transition system, which chains two 2-second movements to shift the eyebrow group down and back up. Built with D3 v7, the visualization loads the library from UNPKG and uses the `select`, `append`, and `arc` APIs to construct and animate the scene.