Rough stereoscopic "outer terrain".
Grains of sand of various colors pour down the three-dimensional terrain, flowing from high to low and piling up, thus representing the shape of the strata.
Where people are standing, the terrain sinks, and grains of sand gather. As people move, the grains of sand bounce off and mix, causing the formation to change shape.
In the day and night of the day, the year of the seasons, and the colors of the sun, water, and the earth, the grains of sand are constantly changing.
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