A smiling yellow face with black features animates its eyebrows, which move upward and then settle back down in a continuous loop. Built with D3.js v5, the visualization uses SVG shapes—circles for the head and eyes, rectangles for the eyebrows, and a path generated with the `d3.arc()` function for the mouth. The eyebrow motion is achieved through chained `transition()` calls that alter the group’s translate transform over two-second durations.