Funny that this would come up. This event was what inspired the last picture in a book I'm working on. In the same vein, I actually built a device once that al

Funny that this would come up. This event was what inspired the last picture in a book I'm working on. In the same vein, I actually built a device once that allowed you to send http messages via black and white marbles rolling down a tube. It was very slow (and the simplest message required refilling the hopper many times). I used some drawings of an old gumball machine to design the dispenser, and I used an Arduino with a color sensor and an LED in a 3d printed tunnel to detect the marble color. I had to bury the sensor inside a tunnel with several twists and turns to block out enough ambient light to get a reliable signal. https://www.networksfromscratch.com/1.html#whats-next https://www.networksfromscratch.com/1.html#whats-next