Soft Terrain is a very soft, three-dimensional slope. Various granules of light flow from high to low elevations along the terrain, layering onto each other and creating a stratum pattern.
The ground sinks beneath people, and granules of light gather in these sunken areas. As people walk, the granules burst out and intermix, changing the stratum pattern.
The color of the granules of light change with the seasons, in the real flow of time.