World Labs, the AI model developer cofounded by AI pioneer Fei-Fei Li, has released its 3D-space generating model, “Marble.” At the World Labs website, creators can now input text prompts, images, or videos of pieces of a real-world environment. Marble uses them to create full 3D environments, which can include interior spaces or expansive exterior ones.

Marble can reconstruct, generate, and simulate 3D worlds—think of it as a type of “world model.” In an interview with Fast Company, Li describes world models as a “significant” evolution of the generative AI era. “The large world model is really a significant step towards unlocking AI’s capability,” a category she calls “spatial.” Spatial intelligence refers to a system’s ability to perceive, model, reason about, and take actions within physical or geometric space—similar to how humans or animals choose their actions based on their understanding of their surroundings. 

World Labs launched in September of 2024, when it began working on the Marble model. Two months ago it released a preview of the model to a group of creatives, who began buliding worlds and giving feedback.

This week, Li posted a sort of

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