This example shows a yellow smiley face built with overlapping SVG shapes: a large circle for the head, two smaller circles for eyes, and an arc path for a smile. The code uses React to render the SVG elements and D3’s `arc()` generator to create the mouth with specified inner and outer radii and angles. Position values are computed from fixed dimensions, and a `stroke-width` of 20 outlines the head in black. The face is centered via a `<g>` transform, with no interactive or animated behavior.