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The model is predicting what the state of the world would look like after a given action.

Along with entertainment, they can be used for simulation training for robots. And allow for imagining potential trajectories

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Marble is not that type of world model. It generates static Gaussian Splat assets that you can render using 3D libraries.

Whenever I see these and play with models like this (and the demos on this page), the movement in the world always feel like a dolly zoom. Things in the distance tend to stay in the distance, even as the camera moves in that direction, and only the local area changes features.

[0] https://en.wikipedia.org/wiki/Dolly_zoom

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