This example shows a smiling face constructed from basic SVG shapes, rendered at 960 by 500 pixels with a yellow circle head, two offset black eye circles, and an arc-based mouth path. Using React for component structure and D3 v7's `arc()` generator to define the mouth’s curved geometry, the code sets the mouth’s inner radius to 0, outer radius to 100, and angles from 0 to π/2. React elements render these shapes into an SVG container, with all positions derived from computed center coordinates and fixed offsets.