The windmill rotates its four black blades continuously against a dark blue sky, with a green ground and gray base completing the static scene. Five small bird shapes fly once across the sky from left to right and then disappear. The D3 v7 code builds the SVG with explicit shape attributes, then uses `transition.attrTween` with `d3.interpolate` to create the infinite blade rotation, while the birds rely on a simple duration-based transition. Animation is driven entirely through D3's transition system without external data.