I am developing some ideas for various clients, and this includes some super simple ones for education where people want a fun activity quick without having to spend ages buying all the equipment and learnign loads of new skills.
one of these is BOUNCE

A simple idea where marbles are bounced along a series of drums with rubber stretched over the top. Like so many things, it really needs a lot of background development to get it working. this came from an idea I saw when I was a child in a friends house. I quickly found that getting the right rubber membrane and holder was essential if you were going to make a reproducible set-up. I solved it by using widely available specialist parts and if the client decides to fund it, I will post a link to the scheme of work some time in 2009 here.