This example renders a single stylized face using an SVG arc for the mouth, with rounded tips created via `d3.cornerRadius()`. The mouth is drawn as a curved path that starts from the left, dips downward, and rises to the right, with the corner radius smoothing the ends into a soft smile. The rest of the face remains simple and abstract, focusing attention on the arc’s shape. It builds on a prior face design by Xinting Yao, demonstrating how a small d3 shape API can transform a basic arc into a characterful visual element.