My 8 year old autistic son absolutely loves these. Therapeutic for him it seems. Theres also videos of people racing marbles down sand tracks. Must take them AGES to set up, very clever. Similar to this, my son has an absolute mountain of marble run equipment. Takes me an age to build, but he loves racing groups of marbles, he gives them all names, and does commentary on it like some you tubers do. He often records himself and im sure he has posted videos to youtube too lol. Domino rally is another thing he loves. It takes so long to build a decent run though, and about a minute to fall down.
