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This example renders a smiling face using React and D3.js. A yellow circle with a black outline forms the head, with two smaller circles for eyes and a D3 arc path creating the mouth. The visualization uses React’s declarative component model to define SVG elements, while the D3 `arc` function computes the path data for the mouth. The drawing is generated entirely in code without external datasets, demonstrating how D3 geometry APIs can be embedded within a React-based SVG rendering pipeline.