Let's Make A Face
A yellow circle face with black eyes and a wide mouth occupies the center of an SVG canvas. The visualization demonstrates basic D3.js shape construction by appending SVG circles for the face and eyes, then generating a mouth path using the `d3.arc()` generator with an inner radius, outer radius, and a half-circle angle range. All elements are positioned with absolute coordinates based on the SVG's width and height, and the code uses D3 v6 selections and the `arc` helper from the d3 module.