Take Some Rubber Bands,

marbles,

some wood and a flat board and you can achieve this interplay with them, designed and executed by Kaplamino, who we have featured before, he has really outdone himself this time, this marble run is relatively short, but it's densely packed with moves that are astonishing, so how many tries did he have to make before it became the perfect run? just 40 tries and he cracked it, I was thinking more like a few hundred tries, by which time I wold have well and truly given up!