Built with D3 v5, this animation shows a cheerful yellow face constructed entirely from SVG shapes, including circular eyes, rectangular eyebrows, and a smile drawn using the `arc` function. The face is centered within an SVG canvas, and the eyebrows perform a looping vertical movement through chained `transition().duration()` calls. This example demonstrates fundamental D3 shape generation and animation techniques using selections, attribute manipulation, and the `arc` generator to create the mouth path.