This example shows a smiley face built with React and D3, rendered as SVG. The face consists of a yellow circle, two black eye circles, a mouth drawn as an arc path, and a nose that is also an arc rotated 180 degrees. The visualization uses D3’s `arc` generator to compute the mouth and nose paths, while React manages the SVG elements and JSX layout. Positioning relies on computed center coordinates and explicit offsets, with all dimensions defined as constants.