These students had a limited time to build something that would slow the ball down as it moved from the top of the 'wall' to the bottom. This design took 6 seconds for a ping pong ball to travel through it. I reckon times in excess of 30 seconds should be achievable with just paper tubes fixed at shallow angles.
The tubes are pieces of paper rolled and pins used to hold the overlapping edges together and pin these through to the pinboard backing
I have suggested to a primary school they build a giant version covering a whole wall, with ramps and tubes, hoppers and swivelling parts, all from thin card and paper with maybe a few swivelling self adhesive bits
