Smiley Face Part I
A yellow circle with two black eyes and an open mouth forms a static smiley face centered in an SVG canvas. The face is drawn using React components that render SVG primitives, including circles for the head and eyes and a d3.arc path for the mouth. The d3 arc generates the mouth shape with specified inner and outer radii and angular extents, while the head and eyes are plain SVG elements. The visualization uses a fixed 960 by 500 pixel viewport with the face grouped and translated to the center.