A grid of randomly generated smiley faces uses React components composed from D3 shape generators and SVG primitives. Each face renders a yellow background circle, two eyes, and a mouth arc created with `d3.arc()`, with randomized radii and offsets for each feature. The `FaceContainer` component produces the SVG output while `range()` from D3 generates the array of faces. All styling and layout values are passed as React props, re-rendering the composition on each page load.