Make your own rail guided marble run and use it as the skeleton. And while they do make their own ( https://www.fischertechnik.de/en/products/playing/profi-dyn

Make your own rail guided marble run and use it as the skeleton. And while they do make their own ( https://www.fischertechnik.de/en/products/playing/profi-dynamic-marble-runs https://www.fischertechnik.de/en/products/playing/profi-dyna... ) you could use it as the structure behind https://youtu.be/kPguktA674w https://youtu.be/kPguktA674w I'll also suggest a "random stuff behind you" for video calls. Rube Goldberg machines.