This example shows a modular smiley face built with React components and SVG, where each facial feature is a separate reusable component. The face is constructed from a yellow background circle, two eyes positioned by offset coordinates, and a mouth drawn using D3’s `arc` generator. The `FaceContainer` wraps the SVG and applies a translation transform to center all elements. The code also includes a placeholder `LineChart` component with empty data, and the `App` sets up an empty array, though the chart itself is not rendered. The visualization uses React 16.9 and D3 v5.