This example shows a simple yellow circle with a black outline and a curved mouth shape, rendered as a static SVG drawing of a smiley face. The visualization is built with React 17 and D3 v6, using the `arc` generator from D3 to create the mouth path with specified inner and outer radii and angular ranges. The circle and mouth are positioned within an SVG element using a centered `<g>` transform, with the circle defined via JSX and the mouth path constructed through D3’s `arc()` API. The rendering is entirely SVG-based, with no interactive behavior or data input.