ASMR videos don't really do anything for me, but I could watch videos of gears and mechanisms doing their thing all day long. I watched this video of 20 mechanical Lego widgets being combined into one useless machine, absolutely rapt. Bevel gears, rack and pinion, camshaft, worm gear, universal joint, Schmidt coupling — this thing has it all.
See also Gears and Other Mechanical Things and a Treasure Trove of Over 1700 Mechanical Animations. (via the kids should see this & meanwhile) Sprockets
