This example shows a partially completed smiley face composed of SVG shapes, with a yellow circular head, black eyes, and an arc-shaped mouth positioned below the face’s center. The visualization uses React to render the SVG elements, while D3’s `arc` generator creates the mouth path based on specified inner and outer radii and start/end angles. All geometry is computed from fixed dimensions, including the head radius, eye offset, and stroke width, with the mouth arc translated separately from the main face group.