Watch this. Will discovers that if he attaches a clothespin to one end of the ribbon, then sends it through a hole in the grid, and then attaches a clothespin to the other end of the ribbon, it becomes a pulley.
It changed color. He notices that the color changes as he moves the pulley.
It swing. the clothespin that’s on the bottom swings.
Oh–it broke again. Sometimes he pulls too hard and the clothespin comes off.
Thomas notices Will’s exploration and shows how to attach a clothespin to the middle of the ribbon.
Sam has his own project, riffing off of his winch system that he had made with the branch piece and the sewing circle string. He wraps a ribbon around and around the bar of the grid.