This example renders a simple animated face using D3 v6 with SVG. The code draws a yellow circle as the head, two black eyes, and a mouth created with the `d3.arc` path generator. The eyebrows, implemented as rectangles, animate up and down using `d3.interval` and chained `transition.attr` calls to shift their vertical position every 1.5 seconds. The visualization demonstrates basic D3 selection, SVG shape creation, and transition-based animation in a minimal starter template.