Marble Run

I have been working with the students developing a range of ideas for the fence running down the side of the school. We have decided to start with a marble run, but not any old marble run this one is inspired by the native plants, trees and animals at Otari Bush Reserve.
The plan is to test some ideas out and then get help to have the student's ideas manufactured, the marble run will need to be well made to stand up to the elements and the children.
I will post more images and designs as the project progresses, the image below is the start of the process of gathering images and simplifying them ready to see how they might work in the marble run.