A face made of simple SVG shapes—a yellow circle, two eyes, eyebrows, and a curved mouth—animates gently on a dark background. D3 v7’s `select` and `append` methods build the graphic, while `transition` chains smoothly move the eye group, eyebrows, and mouth through two-second cycles. The path for the mouth is generated using the `arc` API. This example demonstrates basic D3 transitions and shape construction from scratch.