A large green circle with a thick yellow outline forms the base of a face, with two smaller black circles positioned symmetrically to suggest eyes. The SVG markup is hand-written in `index.html` using basic `<circle>` elements, with coordinates calculated relative to the canvas center and stroke widths. The rendering is static, with no animation or interaction; the README notes the design is halfway to a smiley face. The example relies on raw SVG, not a plotting or visualization library.