A cartoon face composed of SVG shapes animates its eyebrows up and down. The yellow face, red-outlined circle, and black eyes and mouth are built with D3 selections and the `arc()` generator for the smile. Eyebrow motion uses chained `transition().duration(1000)` calls on a group, moving it vertically. The React starter code wraps a static D3 v5 setup, rendering into a centered SVG group on a 960 by 500 canvas.