I tried out some stuff with the marbles and figured out that its really hard to get a stable speed and just a a bit angled ground would destroy the whole timing. So I'll make another lift and use the lift as the display. But it's a bit boring if the marbles just roll back to the start, so I have the idea to make music with the backrolling marbles and diffrent small drumms. I'll start constructing the lift and cut the parts next days.