# water The sea at the foot of the cliff. A flat plane lifted by four travelling waves in the vertex stage; the fragment rebuilds the same waves analytically for its normal, adds two octaves of wind ripple, and shades itself: a dark body colour graded by depth, a Fresnel term toward the sky, one hard specular track for whatever light is in the scene, foam on the crests, and a wash of foam where the water meets the rock, read from the scene depth already drawn behind it. It shades itself rather than handing the engine a `PbrSurface`, because a mirror-smooth PBR water reflects the environment probe as a hard mirror of the face the camera is already looking at. Everything the sea's look depends on is therefore a named property, and `Cliff.component` drives the four colours, the specular strength and the foam from `CF.state.dawn`.