Assembly Line

This is a long lost invention of mine, I found it the other day on my old computer, I had lost its file four years ago. Any ways this is what I wrote about it back then: "This is one of my inventions that I finished a while back. This robot simulates a robotic assembly line. It moves marbles with a tread and then they ride an elevator that takes them up one level. Then it moves down a tread to a thing that flips it into a truck or in the garbage. It depends on what color the marble is, one color goes to the truck the other color goes to the garbage."