Fifteen identical smiley faces, each rendered as a yellow SVG circle with a black stroke, black eyes, and a curved mouth, are stacked on top of one another. The code uses React components like `Face`, `BackgroundCircle`, `Eyes`, and `Mouth` to build each face, while `d3.arc` generates the mouth path. A `range` from d3 creates the array of faces, and random eye radii add slight variation.