Wintergatan was quite a sensation back in 2016 when their marble machine video was released. I've just decided to add their debut album in C&C track list.
Wintergatan is a crazy Swedish group, very active on their youtube Channel, where everyone can follow the progress of their various experimentations, notably the different steps to build their portable marble machine. It is also possible to discover their work on BandCamp...
Their first video was released in January 2013, and you can already notice that some serious work had been done at the time...