The Frontier of Spatial Intelligence with Fei-Fei Li

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Nov 13, 2025

Guest

Justin Johnson

Guest

Fei-Fei Li

Fei-Fei Li, a computer scientist known for her groundbreaking work in AI and co-founder of World Labs, joins forces with Justin Johnson, an expert in computer vision and generative models. They explore the evolution of AI from its early challenges to the current boom in spatial intelligence. The duo introduces Marble, their innovative tool that simplifies 3D scene generation from text prompts. They dive into defining spatial intelligence, the significance of 3D representations, and the future of blending real and virtual worlds in technology.

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ANECDOTE

From Weekend Reimplementation To Impact

Justin reimplemented neural style transfer over a weekend and then optimized it for speed.
His faster version gained traction and foreshadowed practical generative image tools.

INSIGHT

Reconstruction Meets Generation

Reconstruction (3D from images) and generation are converging via methods like NeRF.
Seeing and imagining now both lead to similar generative capabilities in vision.

INSIGHT

1D Tokens vs Native 3D Representations

Multimodal LLMs use a 1D sequence representation that shoehorns other modalities into token sequences.
Spatial intelligence demands native 3D/4D representations for better affordances.

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Fei-Fei Li and Justin Johnson are pioneers in AI. While the world has only recently witnessed a surge in consumer AI, they have long been laying the groundwork for the innovations transforming industries today.

With the recent launch of Marble, the first product from their company World Labs, we are revisiting this conversation to explore the ideas that started it all. World Labs is focused on spatial intelligence, building Large World Models that can perceive, generate, and interact with the 3D world. Marble brings that vision to life, allowing anyone, from individual creators to major platforms, to generate 3D scenes directly from text or image prompts and turn complex 3D creation into a simple, creative process.

In this episode, a16z general partner Martin Casado talks with Fei-Fei and Justin about the journey from early AI winters to the rise of deep learning and multimodal AI. From foundational breakthroughs like ImageNet to the cutting-edge realm of spatial intelligence, they discuss the evolution of the field and what is next for innovation at World Labs.

Timecode:

0:00 – The Next Decade of AI
2:45 – Origins: Backgrounds of the Founders
6:50 – The Rise of Deep Learning & ImageNet
8:00 – Algorithmic Unlocks: Compute, Data, and Supervised Learning
12:00 – From Predictive to Generative AI
16:20 – The Journey to Spatial Intelligence
18:35 – Defining Spatial Intelligence
21:15 – 3D Data, Computer Vision, and Breakthroughs
23:15 – Reconstruction vs. Generation in Computer Vision
24:45 – Spatial Intelligence vs. Language Models
29:00 – Applications: Virtual, Augmented, and Physical Worlds
39:55 – Building World Labs: Team and Vision
41:55 – The North Star: Measuring Success in Spatial Intelligence

Resources:

Learn more about World Labs: https://www.worldlabs.ai

Learn more about Marble: https://Marble.WorldLabs.ai

Find Fei-Fei on Twitter: https://x.com/drfeifei

Find Justin on Twitter: https://x.com/jcjohnss

Find Martin on Twitter: https://x.com/martin_casado

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