This example demonstrates fundamental DOM manipulation and animation with D3.js by building a smiley face from SVG shapes. A red circle forms the head, with appended circles for eyes and rectangles for eyebrows, while a mouth is drawn using the `arc` generator. The code uses `selection.append` and `transition.attr` to move the eyebrow group up and down over two seconds. All elements are positioned relative to a centered `g` container, using D3 v5’s modular `select` and `arc` imports, with the SVG defined statically in HTML.