A blue smiley face drawn with SVG shapes cycles its eyebrows upward and downward in a looping animation. The example demonstrates fundamental DOM manipulation in D3.js, using `d3.select` to append circles, rectangles, and a path to an SVG canvas. The mouth is created with the `d3.arc` generator, while eyebrows animate via chained `transition().duration()` calls that move their containing group's `transform` attribute.