This example shows a simple smiley face constructed from four circles: a large yellow face, two black eyes, and a curved yellow mouth. The visualization is rendered as static SVG directly in the HTML document, with no interactive or animated behavior. The code uses plain SVG elements and CSS for styling, specifically setting the `fill`, `stroke`, and `stroke-width` attributes on the circles. The face is centered in a 960 by 500 pixel viewport, with the mouth drawn as a partial circle to suggest a smile.