Inside Fei-Fei Li’s $1 billion new AI company, World Labs

Walking into World Labs—the San Francisco startup cofounded by Fei-Fei Li, known in tech circles as the “godmother of AI”—visitors are met with a wall tiled in rainbow hues. A grand piano beckons at the end of the deep, sunlit lobby. Chair-size iridescent spheres rest against the walls, as if a giant forgot to pick up his toys. But around the corner, the walls and floor look scrambled, like a cubist painting left out in the rain. Luckily, this “world” is just a simulation of the World Labs lobby...