This example shows a smiling face built entirely from SVG shapes, centered in a 960x500 viewport. The face uses a yellow circle with a black stroke for the head, two smaller circles for eyes, and a D3-generated arc for the mouth. The visualization is rendered with React components, and the mouth’s path is computed using the D3 `arc` generator with explicit start and end angles converted from degrees to radians. React 16.9 and D3 v5 are loaded via UMD bundles, with all geometry defined by constants for positioning and sizing.