A developer built a file-sharing system that transfers data without Wi-Fi, Bluetooth, cables, or even a shared network. The sending phone converts a file into a rapid sequence of animated QR codes. A second phone scans the frames with its camera and reconstructs the original file. To handle missed or unreadable frames, the system uses fountain codes. Each QR code carries a different combination of file data, allowing the receiving device to recover the complete file even when some frames are lost. During testing, a 2 MB image transferred at approximately 129 KB per second. The open-source project was built in one night using Claude Code. The idea emerged while the developer was creating a cached MP3 player and needed a simple way to move songs between phones without connecting them to the same network. The solution was simple: display the file across the screen and let the camera capture it. #futuretech #technology #ai