GitHubWhat they did
Reddit user u/ramramlab wanted a webcam effect where an unlit bulb appears to glow, with the light falling on their hands and body. They built it entirely in conversation with Claude. Claude wrote a WebGL shader for the glow, code to find the bulb, and hand and body tracking with MediaPipe, then deployed the page to GitHub Pages. Because it could not see the webcam, Claude made its own synthetic test videos with moving, blurred and distant stickers plus decoys, and ran each change against them in a headless browser before shipping.
How it went
The effect works in real time on the poster's webcam feed, shown in a demo video. An earlier attempt to train a model to find the clear glass bulb failed, since clear glass is hard to track in the dark, so they stuck a green sticker on the bulb instead. They were still asking for ideas to detect a bare bulb.
Worth knowing
It is a visual trick, not a real saving: the title's joke about the electric bill confused some commenters. Having the agent generate its own fake test footage is what let it check vision code it could not see run. A commenter suggested edge detection to find a bulb without a sticker. The post does not say which Claude tool or harness was used.