This example shows a simple smiley face built with SVG shapes positioned around a central point. The face uses two circles for eyes, a red circle with a black stroke for the head, and a D3-generated arc path for the mouth. The code relies on React for component rendering, while D3’s `arc()` generator defines the mouth’s inner and outer radii and start/end angles. D3’s `select` is imported but not used, and the SVG is rendered directly into the DOM with a fixed 960x500 viewport.