This example shows a yellow smiley face rendered as an SVG, with two static eyes and a curved mouth positioned symmetrically around the center of a 960-by-500 canvas. The face is built using React components for the circle elements, while the mouth is generated with the `arc()` function from d3, specifying inner and outer radii and start and end angles. The visualization uses React 16.9 and d3 v5, with all shapes drawn directly in SVG coordinates.