I found myself asking both Hoody and Jelle the same thing, so I'll start a thread on it.
Where do you guys set up your marble runs? I've seen some of the answer, but I'm really overwhelmed by this. Some are permanent and some are portable. Some are done at conventions and some are done at museums. And????
Basically, this is a new topic to me. Just how big are marble runs in your part of the world? By "big" I don't mean in size ... I mean more about interest and participation.