Smiley Face Part I
A grid of 18 randomly generated smiley faces, each with a yellow circular head, black outline, eyes, and a mouth, demonstrates how React components can be composed for data-driven SVG visualization. The code uses React 16 and D3 v7, leveraging D3's `arc` generator to create the mouth path and its `range` function to generate the face count. Each face receives randomized stroke width, eye offset, eye radius, and mouth dimensions via props, producing a varied but consistent visual pattern across the gallery.