# The Lightbulb Computer: a projector that screws into your ceiling

A speculative design project swaps smart glasses for a giant light bulb that projects widgets, maps and recipes onto your real surfaces, and knows where you're pointing.

- Category: Inspiration (concept)
- Made by: [Guillaume Ardaud](https://lightbulbcomputer.com/) on Personal site
- Original: https://lightbulbcomputer.com/
- On Afterware: https://afterware.xyz/p/the-lightbulb-computer-a-projector-that-screws-into-your-ceiling

## Can I build this?

- Difficulty: Advanced
- AI-buildability: 3/5 (The pointing detection, vision model calls and projected widget UI are software AI can write, but fitting a projector, camera and compute into a bulb-shaped housing and calibrating them is hands-on hardware work.)
- Time: A few weeks
- Cost: $200–500
- Tools: 3D printer, soldering iron, multimeter

Estimates based on the original write-up. How the AI-buildability score works: https://afterware.xyz/ai-buildability

## Starter prompt

```
Based on "The Lightbulb Computer: a projector that screws into your ceiling" on Afterware: https://afterware.xyz/p/the-lightbulb-computer-a-projector-that-screws-into-your-ceiling

Help me build a prototype of a ceiling-mounted projector with a camera that detects where a person points. Use a Raspberry Pi 5 with a Pi camera module and a small pico projector, driven from a Python app. The app should take voice commands, detect a pointing gesture on a flat surface, and project a recipe timer onto that spot.
```

## Story

Instead of strapping a screen to your face, the Lightbulb Computer puts a projector and camera in a bulb-shaped housing that screws into any Edison socket. Point at the kitchen counter and a timer appears there. Point at a lamp and the smart home controls for it show up on the wall beside it.

The demos come from a real but bulky prototype, not renders or AI video. The designer's pitch is that projectors are getting smaller and brighter and vision models can now read a bookshelf in milliseconds, so the hardware is close even if consumer versions aren't. Privacy gets a hard-wired indicator light, a physical camera cover and on-device processing.

It's worth a look if you want a spatial interface that doesn't need a headset. The lamp-base mount, voice plus pointing input and shared wall-sized map are the ideas to steal.

## Resources

- [Project site](https://lightbulbcomputer.com/)
- [Video version](https://www.youtube.com/watch?v=0R-9qkjPEqg)

Tags: projector, computer vision, ambient computing, spatial ui, smart home, voice control

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