Captain Disillusion, the finest bullshit detector on YouTube, does a nice job explaining this video of a machine separating thousands of marbles by color without any sort of detector.
If it seems impossible, that’s because it is.
As with any great magic trick, the reveal is even more fascinating than the final performance. I’m in awe of how much work it took to create the effect even after watching how it was made.
As usual, if you’re not supporting Captain Disillusion’s work, you should. He’s one of the best.