Someone built a 3,528-disc flip-dot wall display and open-sourced the whole thing. Nine Alfazeta panels in a 3x3 grid, driven by an Nvidia Orin Nano running MediaPipe for gesture recognition. The result is interactive art that responds to your hands and voice, rendered on electromechanical discs that have been around for over 80 years. Flip discs use electromagnetic pulses to flip small discs between two colors. They're readable in any light, don't cause eye strain like LEDs, and make a rain-on-window sound when they update. The catch is sourcing them. Alfazeta, the Italian manufacturer behind those iconic train station displays, has shifted focus to LED technology. New panels are rare and expensive. The software side is where it gets modern. Node.js handles display control, a REST API manages visualizations, and rendering pulls from PIXI.js, Three.js, and Matter.js for physics. Everything runs in real-time rather than pre-rendered, which is why it needs the Orin Nano's GPU for MediaPipe gesture and image recognition. Communication happens over RS485 serial, with frames compressed using RLE. Full build guides, software docs, and hardware recommendations are at flipdisc.io. The creator admits it's niche, but combining 80-year-old mechanical display tech with modern ML is a genuinely fun engineering challenge.