This example builds a smiley face using React and D3 v5, rendering all shapes as SVG elements. It uses D3’s `arc()` generator with custom start and end angles to create the mouth and both eyebrows, which are then rotated and translated via SVG transform attributes. The face includes yellow and lightblue eyes with dark pupils, a purple triangular nose, and black hair and facial hair paths. The code demonstrates composing geometric primitives with D3 path generators within a React component.