A grid of React-generated smiley faces, each rendered as an SVG, demonstrates component modularity and randomization. The code assembles faces from separate components for the background, eyes, and mouth, using D3's `arc` to draw the mouth path. Each face applies random multipliers to the eye and mouth widths, creating visual variety across the array. The example showcases ES6 module splitting and React Fragments for grouping SVG elements without extra wrapper nodes.