Smile face
This visualization draws a classic smiley face using D3’s `arc` generator for the mouth and SVG circles for the head, eyes, and outline. The face is centered on a 980×620 canvas, with a yellow circle, black eyes, and a filled arc representing the smile. React renders the SVG elements declaratively, while D3 v7 handles the arc path computation. The code uses degree-to-radian conversion to define the mouth’s start and end angles, creating a clean, symmetrical cartoon face with no interactivity or data input.