This example shows a smiley face composed of SVG circles for the head and eyes, plus a D3-generated arc path for the mouth. Built with React, the visualization uses ReactDOM to render a single SVG element, while D3’s `arc()` function computes the mouth’s curved shape based on predefined radius and angle values. All geometry—including eye offsets, stroke widths, and radii—is defined as JavaScript constants, and the rendering is purely static with no interaction or data updates. The code relies on D3 v5 and React 16.9.