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It absolutely matches the reflection in the water - you can see the hard hat of the person and the colour transition.

The change in colour will be the result of a change in source of boulder. The whole point is that they are "recycling".

where were the wireframe mesh rocks sourced from?

The excavator creates a mesh of each stone by scanning it "in hand", and updates the settled positions of them as it builds. The left side of the image is the 3D digital twin model that is maintained by the system, captured from the same perspective to show how it matches the real wall.

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