A React and D3 v5 example renders multiple smiley faces in an SVG grid. Each face uses reusable components for the background circle, eyes, and mouth, with the mouth’s arc generated by D3’s `arc()` generator. Random eye radii and a fixed mouth shape vary each face. The `FaceContainer` applies a centered translation, and React’s `map()` over a `range(4*3)` array creates a 12-face layout.