A stylized face rendered as SVG animates its nose and eyebrows with chained `transition` calls, while the mouth stays fixed using a `d3.arc` path. The circular yellow head and black stroke frame the components, and the nose bounces horizontally in a repeating loop triggered by `setTimeout`. The code uses `d3.select`, `d3.arc`, and attribute transitions, with dimensions parsed from the SVG via `parseFloat`. The brows move vertically in a two-second cycle, creating a simple, playful expression.