It was the last Sunday of Rube Goldberg month at the Front Porch Library. We all had a good understanding of simple machines–all six–and we’d built a catapult that threw rocks, although as Ryleigh pointed out, not very far, but we had yet to build a crazy machine. Desperate, Ray nailed plywood to the front of the library and we built a water wall (think recycled bottles, duct tape and water flowing through the whole caboodle. Voila!