This example renders a grid of 18 cartoon faces built with React components and D3.js. Each face is composed of a yellow head circle, two eyes, and a curved mouth arc created using `d3.arc`. Random values are applied to stroke width, eye placement, eye radius, and mouth dimensions, giving each face a unique expression. The faces are drawn as SVG elements within a `<g>` transform, with the layout generated using `d3.range` to map over the array.