It reminds me of a Turner’s Cube. Which is just a pointless gee-gaw that machinists make to sharpen and show off their skills
Name them after the oil execs. “In tonight’s new the death toll climbs to 11,000 in the Darren Woods heat event…”
That is called a flex shaft. You’ll see them commonly on rotary tool like Dremel. That’s an interesting application in the video. Changing the input on the shaft is basically like shifting a transmission.