tl;dr: A former Apple designer prototypes the "Lightbulb Computer," a projector-plus-camera device in an Edison bulb form factor that projects interactive interfaces onto real-world surfaces—recipes on counters, maps on tables, controls near smart home devices—and responds to voice and pointing gestures. The author pitches it as a social, ambient alternative to both screen-based and face-worn (AR/VR) computing, arguing projector and computer vision tech is nearly ready for a consumer version, with privacy handled via on-device processing and hardware camera guards.