Smiley face part I
This example renders a yellow smiley face using SVG primitives within a React application. The face is composed of circles for the head and eyes, with D3's `arc` function generating the path data for the mouth and nose. The visualization is built using React's declarative syntax, with D3 v5 providing the arc geometry calculations. The code also demonstrates styling individual elements with stroke widths and colors, including distinct stroke colors for each inner eye.