One of the simplest but most enjoyable Rube Goldberg machines I’ve ever seen

This one is all about following the blue marble. It all happens on a tilted board so watching that marble create its own path and modify it as it travels is super satisfying to watch. I also love the way the marble is propelled upwards by magnets and other simple setups. The creator says it took about 3 months to build and 500 attempts to get it to work all the way to the end.