Section A (Left): A 3D cross-section diagram of a golf putting green. It shows a meticulously engineered “big pot” structure. The top is a thin layer of turf, followed by layers of sand and pea gravel, with a corrugated drainage pipe at the bottom. A golf ball is visible on the surface, and a golf cup is set into the layers.Section B (Right): A photograph of a house under construction. In the foreground, there is a large, messy pile of heavy, clumpy, clay-like soil. The house behind it is in the framing and siding stage, sitting on this raw subsoil.