Smiley Face 1
A grid of eighteen randomly generated smiley faces fills the viewport, each face rendered through React components that assemble SVG circles for the head and eyes and a D3 arc path for the mouth. The `d3.arc()` API generates the mouth shape, while `Math.random()` varies each face’s stroke width, eye offset and radius, and mouth dimensions, resulting in a playful, diverse array of expressions. The SVG is composed in `FaceContainer`, which centers all elements via a translation group.