The general idea behind this project is to make a marble "preform." For many people this means different things. My design utilized the ability the marble has to move the structure itself. I chose to use the weight of the marble to make the structure rock on a curved bottom. The movement of the structure would allow the marble to explore more of the structure than it would have been able to if the paper structure were in a fixed position.
My interpretation of the marble's "performance" was not that it would move from point "a" to point "b," but the marble moves from point "a" back to itself. The marble would return to its starting position on the structure, but not in space. It would end at a lower point in space than the point that it began. Beginning and ending at the same point in space with friction and air resistance is physically impossible.