A yellow circle with a black outline serves as a face, featuring two black eyes and a curved mouth created with the `arc` generator. The left eye animates horizontally via chained `transition().duration()` calls, shifting 50 pixels to the right and back over two seconds, while the right eye and mouth remain static. Using D3 v5 selections, the SVG elements are appended inside a centered group and the animation relies on D3’s built-in transition system. The face is rendered entirely with SVG shapes on a 500×500 canvas.