This example shows a simple, smiling face built from primitive SVG shapes and gradients in D3 v5. The code uses D3’s `select` and `arc` APIs to create a yellow circular head, two eyes of different sizes, small eyebrow rectangles, and an arc-based mouth. Gradients are defined in SVG `<defs>` and applied to the head and background, while static positioning values control the facial feature layout. No data is loaded; the visualization relies entirely on hardcoded geometry and styling.