Marble gives creators a way to specify a generated world's layout before asking AI to finish its appearance. World Labs describes Chisel, an experimental editing mode, in its Marble announcement: users arrange simple three-dimensional shapes or imported assets, then add a text description of the desired style. The layout supplies spatial structure while the prompt guides appearance. This offers more direct control over object placement than asking the model to invent a complete world from text alone. Generated worlds can also be exported as meshes for use in other 3D tools.
