Fei-Fei Li

AI’s next frontier is Spatial Intelligence, a technology that will turn seeing into reasoning, perception into action, and imagination into creation. But what is it? Why does it matter? How do we build it? And how can we use it? Today, I want to share with you my thoughts on building and using world models to unlock spatial intelligence in this essay below. 1/n

@jamesckane @threejs @sparkjsdev @Blender @theworldlabs whoa! very nice!🚀

More work on STARSPEED's procedural spaceship generator 🚀 @threejs/@sparkjsdev web app is a visualizer & parametric GUI for @Blender API scripting + export Using @theworldlabs Marble 1.1 environments w/ 3DGS env maps to preview glTF content w/ various scene lighting options

60 million Gaussian splats. One massive dark fantasy world ready to explore! ⚔️ Created entirely with Marble, this persistent world is brought to life in-browser via our Spark 2.0 LoD system and Three.js Fly through it yourself and learn more about how it was made 👇

Expand is now available to everyone! Extend your world in any direction you choose: around corners, into rooms, and beyond what you can see 👀

Really cool we’re at the point where you can build custom, personalized tools for your own niche 3D workflows. Built this with GPT-5.5, Spark, and Marble yesterday to get better precision + control for creating collider meshes for 3DGS experiences. Live: splat-collider-builder.netlify.app

2 Weeks. New Tools. Infinite Worlds🚀 The World Jam is LIVE. Build the future of interactive 3D with Marble 1.1 + Spark LoD. Join our Discord to start building. More info below 👇

@RonConway Prayers to you and your family Ron! 🙏

I want to share some difficult news. I was recently diagnosed with a rare form of cancer and I want you to hear it directly from me. Treatment is starting immediately and will include multiple strategies over the course of about a year. While I will be stepping back from some of my usual activities, I will continue to support SV Angel founders, who I love with a passion. SV Angel remains unchanged. Topher has made all of our investment decisions for the better part of the last decade, and Ronny joined as Managing Partner in 2024. They bring experience from nearly every major technology cycle in Silicon Valley and are now focused on partnering with founders building the future of AI. SV Angel has a deep, experienced team that remains fully focused on supporting exceptional founders. With a more focused and balanced schedule, I can prioritize treatments while helping SV Angel founders at inflection points like we always do! I’ve chosen not to share the specific type of cancer since I don't want speculation about my prognosis. I appreciate your understanding and respect for this. I am optimistic about my prognosis. I am fortunate to have the best/amazing team of UCSF doctors in San Francisco, and as you know, I never back down from a fight. Thank you for your support, it means a great deal to me.

I recently gave some talks on PointWorld. In this latest version, I discussed: Why world models? Why 3D? Why it matters amidst scaling data in robotics? Why it’s a missing side of the coin for “The Bitter Lesson”? (It’s more than just a better backbone for training policies) youtube.com/watch?v=0vfgm8…

@sparkjsdev Spark 2.0 can now stream 100M+ splats on any device! So proud to contribute to the open source ecosystem of web-based 3DGS rendering!❤️‍🔥🌐

Spark 2.0 is here! 🚀 We’re redefining what’s possible on the web with a streamable LoD system for 3D Gaussian Splatting. Built on Three.js, you can now stream massive 100M+ splat worlds to any device from mobile to VR using WebGL2. All open-source. Dive into the tech 👇

Sparkjs 2.0 is out! Support for arbitrarily large splats on web, mobile, and VR. Tons of features: LoD, streaming, editing, multi-splat, mesh integration, ray casting etc. etc. If you're worried that AI is going to take over all coding, work on a splat renderer for a bit :)

@mountain_mal @theworldlabs 🤩🌐

update: enhanced 3d world generation just dropped in Teleport with @theworldlabs marble 1.1 16 iPhone photos → fully explorable 3d world in minutes 📸 golden gai, shinjuku 🇯🇵

Capture your space. Create worlds. Use Marble 1.1 to reconstruct real-world locations from a few images, then restyle them however you want. Go from a real place to a custom persistent 3D world in minutes.

@smallfly @theworldlabs Beautiful!

Playing with scale by stepping into a stamp. Did a quick (and rough) capture of my desk with a stamp on it, then used @theworldlabs’ Marble to generate and step into the interior of the depicted scene of the Chartres Cathedral. It’s quite hard to explore these different scales in real time. Rendered using @sparkjsdev. #AI #GenerativeAI #WorldModels #GaussianSplatting #3DGS #sparkjs #threejs

@martin_casado So true!

Incredible how quickly 3D world generation is coming along. This is a single AI generated 3D scene, not real time video.

see around corners with Marble 1.1 Plus 👀

@tamrrat 🤩🌐

I've been testing the new models for different types of spaces, and the results are honestly amazing! 🌍 Marble 1.1 Plus → significantly expanded worlds 🌎 Marble 1.1 → noticeably sharper worlds

I recreated the Backrooms trailer entirely using the new @theworldlabs models 🤯

Making improvements one step at a time for Marble. In the case of generating bigger worlds, it's quite literal ;) 🤩🌐

@hafftka 🙏

GM “Portrait of Fei-Fei Li” 2026 30” x 22” watercolor and ink wash on handmade paper “AI is made by humans, intended to behave by humans, and ultimately to impact humans’ lives and human society. There is nothing artificial about it.” While Hinton warns, LeCun argues, and Musk performs — she says simply: I am a person before I’m an AI technologist. @drfeifei #Hafftka #FeiFeili #AI #WeAreNotInKansasAnymore #HumanCenteredAI

It’s 11th year and counting! Teaching the first lecture of @cs231n every year has been a highlight of my spring seasons. As usual, I asked students which departments or schools they come from @Stanford . Increasingly, students raise their hands to indicate that they come from all seven schools on campus, from @StanfordEng to @StanfordMed @StanfordHumSci @StanfordGSB @StanfordLaw @StanfordEd @stanforddoerr . AI is truly a horizontal technology that excites students across all backgrounds and disciplines!🤩

@Michael_J_Black You are a legend @Michael_J_Black ! So excited for your new chapter!

Tomorrow, I start a new full-time position as VP Digital Human Research at Epic Games. (And no, this isn’t an April Fools’ joke.) Today, I’m taking early retirement from Max Planck and will become an Emeritus Director. As an Emeritus Director, I will continue to supervise my remaining students, oversee ongoing projects, and wind down my department over the next couple of years, which is a normal process when a director retires. Being a Max Planck director is the best academic job in the world and it has been my great honor to co-found and help build the Max Planck Institute for Intelligent Systems. I love the institute deeply. But my statutory retirement age was looming and I’m not done yet. I’ve been working on capturing and modeling human movement for 30 years and it has gone from a fringe topic to something that works robustly and has immense potential. With AI today, scale matters, and achieving that scale increasingly requires industry. In particular, digital humans are moving from research prototypes to foundational technology across industries. At this point in my career, I want to get this technology into the hands of millions of users, while pushing the frontier of digital humans. I know that this is a challenging time for the games industry. Such times are precisely when people get creative, the industry is open to change, and real innovation can take root. Epic Games is the ideal place for this. The talent is deep, there is a compelling vision for how games will evolve, and the commitment is clear. I’m excited to join them and the rest of the Meshcapade team. There is no good way to express on social media the depth of my gratitude to the Max Planck Society, my co-directors, students, post docs, and staff. It has been an amazing 15-year journey because of you. Thank you.